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Coolant Hoses and Pipes (Rear engine cars)
This coolant hose is engineered to replicate the original Porsche part’s fit, material and function for the cooling system of Porsche 911 (996 & 997 series). It connects the engine to the supply pipe, ensuring proper coolant flow and stable engine temperatures under all conditions. One end fit the coolant tube the other end fits to the oil pump connecting flange 99710621600
Fits:
Porsche 996 C2 / C4 / C4S 2002 - 2005
Porsche 997.1 C2 / C4 2005 - 2008
Porsche 997.1 C2S / C4S 2005 - 2008
Diagram ref no 23
• Location: Cooling system hose, generally the engine to supply/coolant pipe connection.
• Replacement: for factory numbers 997 106 831 03 and cross-references 996 106 831 01, 997 106 831 02.
• Function: This hose conducts coolant between the engine block and the external supply pipe (or radiator / heat exchanger) as part of the cooling circuit. Correct hose quality and routing are critical to maintaining engine temperature regulation, preventing overheating and avoiding coolant leaks.
Over time, coolant hoses can become hardened, cracked, swollen or leak due to heat cycles, pressure changes and age. A compromised hose may lead to coolant loss, engine overheating, or reduced cooling efficiency.
Replace this hose when:
• The original shows signs of cracks, bulging, oil or coolant staining.
• You notice coolant loss, overheating warnings or low coolant levels.
• You are performing a cooling system overhaul or replacing related pipes/fittings.
Installing this hose restores reliable coolant flow, proper fitment and long-term durability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710683103
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08

Fits:
Porsche 997 Gen 1
Porsche 997 Gen 2
Porsche 987 Boxster Gen 1
Porsche 987 Boxster Gen 2
Porsche 987C Cayman Gen 1
Porsche 987C Cayman Gen 2
Manual & Tiptronic cars.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
WATERPIPEKIT03
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12

It's a common problem with 987 & 997 models that front coolant and cross over pipes behind the front wheels start weeping and become badly corroded, this kit replaces the ones you might need.
Fits:
Porsche 997 Gen 1
Porsche 997 Gen 2
Porsche 987 Boxster Gen 1
Porsche 987 Boxster Gen 2
Porsche 987C Cayman Gen 1
Porsche 987C Cayman Gen 2
Manual & Tiptronic cars.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
WATERPIPEKIT05
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
This OE Match radiator and coolant pipe replacement kit is an all-in-one set of high-quality hoses and pipes engineered to replace the most common radiator and coolant delivery lines on Porsche 987 Boxster / Cayman and 997 Carrera models. Designed to match the factory routing and fitment, the kit includes radiator feed and return hoses, upper intake pipes, bypass lines, and related OE Match connectors required for a thorough cooling system service or overhaul.
Fits:
Porsche 997 Gen 1
Porsche 997 Gen 2
Porsche 987 Boxster Gen 1
Porsche 987 Boxster Gen 2
Porsche 987C Cayman Gen 1
Porsche 987C Cayman Gen 2
Manual & Tiptronic cars.
As engines age and operate under heat cycles and pressure, rubber hoses and coolant pipes can become soft, cracked, swollen, or restricted, leading to leaks, overheating, and reduced cooling performance. This comprehensive OE Match kit provides direct-fit replacements for the critical coolant lines between the radiator cores, coolant pump, thermostat housing, heater core, and engine block. Each component in the kit is manufactured to meet or exceed the original Porsche specification in hose inner diameter, bend geometry, wall thickness, and connection profile so that it installs cleanly into factory brackets and ports without modification. OE Match materials are chosen for long-term resistance to heat, coolant chemical exposure, and mechanical stress, ensuring durable performance throughout the life of the engine. This kit simplifies maintenance and repair by grouping all key radiator and coolant pipe replacements into one convenient solution, reducing parts hunting and ensuring that worn or deteriorated hoses do not compromise the cooling system’s integrity after other components (such as radiators or pumps) are serviced.
What This Kit Does:
The coolant and radiator pipes in this kit work together to:
- Carry coolant flow between the engine, thermostat, heater core, coolant pump, and radiator
- Maintain correct pressure and temperature balance across the cooling system
- Support reliable heat rejection through the radiator cores
- Prevent coolant loss and overheating due to brittle or collapsed hoses
- By matching OE geometry and fitment, these hoses help maintain efficient coolant circulation and stable operating temperatures during normal driving as well as spirited use.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
RADANDPIPEKIT997.OEM
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
This Genuine Porsche OE radiator and coolant pipe replacement kit is a comprehensive collection of factory-specified hoses, pipes, and coolant connections designed for Porsche 987 Boxster / Cayman and 997 Carrera models. Every component in the kit is a Genuine Porsche part, manufactured to original factory standards for fit, material quality, and long-term durability.
Fits:
Porsche 997 Gen 1
Porsche 997 Gen 2
Porsche 987 Boxster Gen 1
Porsche 987 Boxster Gen 2
Porsche 987C Cayman Gen 1
Porsche 987C Cayman Gen 2
Manual & Tiptronic cars.
This Genuine Porsche OE kit provides a complete solution for renewing the primary coolant and radiator pipework throughout the vehicle. It includes the key upper and lower radiator hoses, coolant feed and return pipes, and related connecting lines that form the core of the Porsche 987 and 997 cooling system.
Each component is engineered by Porsche to maintain exact factory routing, correct internal diameters, and precise sealing interfaces, ensuring optimal coolant flow and pressure balance. Genuine Porsche rubber compounds and pipe materials are designed to withstand extreme thermal cycling, coolant chemistry, and engine vibration over extended service life.
This kit is ideal when replacing radiators, performing water pump or thermostat service, or carrying out preventative maintenance on higher-mileage vehicles. Using all Genuine OE parts ensures the cooling system operates exactly as intended by Porsche engineers, without compromise in fitment, reliability, or performance.
What This Kit Does:The coolant and radiator pipes in this kit work together to:
- Carry coolant flow between the engine, thermostat, heater core, coolant pump, and radiator
- Maintain correct pressure and temperature balance across the cooling system
- Support reliable heat rejection through the radiator cores
- Prevent coolant loss and overheating due to brittle or collapsed hoses
- By matching OE geometry and fitment, these hoses help maintain efficient coolant circulation and stable operating temperatures during normal driving as well as spirited use.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
RADANDPIPEKIT997.OE
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Sold each
Fits:
Porsche 986 Boxster - 1997 to 2004
Porsche 987 Boxster / Cayman - 2005 to 2012
Porsche 993 - 1994 to 1998
Porsche 997 - 2005 to 2012
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90037801301
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Sold each

Fits:
Porsche 986 Boxster - 1997 to 2004
Porsche 987 Boxster / Cayman - 2005 to 2012
Porsche 993 - 1994 to 1998
Porsche 997 - 2005 to 2012
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90037801301
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13

Fits:
Porsche 997.1 Turbo 2007-09
Porsche 997 GT3 2007-09
Click 'Zoom in' for large parts diagram.
Diagram ref no 16
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710625101
The product you are viewing cross references to these numbers
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09

Fits:
Porsche 997.1 turbo - 2007 to 2009
Porsche 997 GT3 - 2007 to 2009
Click 'Zoom in' for large parts diagram.
Diagram ref no 16
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710625101
The product you are viewing cross references to these numbers
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09

Fits:
Porsche 987 Boxster / S 2005>> MKI & MKII
Porsche 987C Cayman / S 2006>> MKI & MKII
Porsche 997 Carrera 2005>> MKI & MKII (Coupe / Cabrio)
Porsche 997 Turbo/GT2 MKI & MKII 2007>>
Porsche 997 GT3 2007>>
Click 'Zoom in' for large parts diagram.
Diagram ref no 28.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710655103
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12

Fits:
Porsche 987 Boxster / S 2005>> MKI & MKII
Porsche 987C Cayman / S 2006>> MKI & MKII
Porsche 997 Carrera 2005>> MKI & MKII (Coupe / Cabrio)
Porsche 997 Turbo/GT2 MKI & MKII 2007>>
Porsche 997 GT3 2007>>
Click 'Zoom in' for large parts diagram.
Diagram ref no 28.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710655103
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Connects from the engine coolant supply line to the left side radiator.
Fits:
Porsche 987.1 Boxster / S 2005 - 2008
Porsche 987.2 Boxster / S 2009 - 2012
Porsche 987C.1 Cayman / S 2006 - 2008
Porsche 987C.2 Cayman / S 2009 - 2012
Porsche 997 GT3 2007-2010
Porsche 997.1 Carrera 2 / 2S 2005 - 2008 CABRIO/COUPE
Porsche 997.2 Carrera 2 / 2S 2009 - 2010 CABRIO/COUPE
This product supersedes Porsche's old part numbers:
- 99710662103
Diagram ref no 9.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710662105
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Coolant Bottom Hose Supply - Left
Keep your Porsche's cooling system operating at peak
efficiency with this OE Match Coolant Bottom Hose Supply Left, designed for selected Porsche 987 Boxster, 987C Cayman and
997 models. Manufactured to OE specifications, this premium replacement
coolant hose provides the correct fit, flexibility and durability required to
ensure reliable coolant circulation throughout the engine cooling system.
Fits:
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Diagram ref no 9
As a vital part of the cooling circuit, the lower supply hose carries coolant between major cooling components, helping regulate engine temperature and maintain optimum operating performance. Replacing worn or ageing coolant hoses is an important part of preventative maintenance and helps reduce the risk of coolant loss, overheating and expensive engine damage.
What Does the Coolant Bottom Supply Hose Do?
The left-hand coolant bottom supply hose forms part of the engine's coolant circulation system, allowing coolant to flow efficiently between the radiator and engine cooling circuit.
Its primary functions include:
- Carrying coolant through the engine cooling system.
- Maintaining consistent coolant circulation.
- Helping regulate engine operating temperature.
- Supporting efficient heat transfer from the engine to the radiators.
- Maintaining correct cooling system pressure.
- Helping prevent engine overheating.
A correctly functioning coolant hose is essential for reliable cooling performance in all driving conditions.
Why Do Coolant Hoses Fail?
Coolant hoses operate under constant heat, pressure and
vibration. Over time they naturally deteriorate due to:
- Continuous heat cycling.
- Age-related hardening and cracking.
- Internal coolant pressure.
- Exposure to coolant additives and contaminants.
- Engine vibration.
- External abrasion from surrounding components.
As the hose ages it may become brittle, swell, soften or develop small leaks that gradually worsen over time.
When Should the Coolant Bottom Hose Be Replaced?
The coolant hose should be inspected during routine
servicing and replaced whenever signs of deterioration are found, including:
- Coolant leaks.
- Cracked or perished rubber.
- Bulging sections.
- Soft or weakened hose walls.
- Coolant staining around hose joints.
- Damaged or corroded hose connections.
Many Porsche specialists recommend replacing ageing coolant hoses whenever the cooling system is being overhauled or when replacing the water pump, thermostat, radiators or expansion tank.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710662105
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Right Hand Radiator Feed Pipe
This right-hand radiator feed pipe is designed for Porsche
997 and 987 Boxster / Cayman models. It forms a vital part of the front-mounted
cooling system, carrying coolant from the engine towards the radiator to ensure
efficient heat dissipation.
Fits:
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 GT3 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII GT3 2010-11
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Diagram ref no 10
With Porsche’s mid- and rear-engine layouts, coolant must travel long distances between the engine and front radiators. This makes the condition of coolant pipes critical to maintaining stable engine temperatures and preventing overheating.
What This Radiator Feed Pipe Does
The radiator feed pipe transports coolant from the engine to the front radiator on the right-hand side of the vehicle.
It helps:
• Maintain continuous coolant flow through the cooling
system
• Transfer heat away from the engine to the radiator
• Support stable engine operating temperatures
• Ensure efficient cooling under all driving conditions
• Maintain proper pressure within the cooling circuit
Without a properly functioning feed pipe, coolant flow can be restricted or lost entirely.
Why Radiator Feed Pipes Fail
Over time, coolant pipes are exposed to heat, pressure and environmental conditions that lead to wear and failure.
Common causes include:
Corrosion (on metal sections)
Exposure to moisture and road debris can lead to corrosion over time.
Cracking or splitting
Plastic or rubber sections can become brittle and fail.
Seal and joint deterioration
Connections can weaken, leading to leaks.
Age-related wear
Long-term exposure to heat cycles reduces material strength.
Symptoms of a Failing Radiator Feed Pipe
• Coolant leaks under the vehicle
• Low coolant warning messages
• Engine running hotter than normal
• Visible corrosion or damage on the pipe
• Sweet coolant smell after driving
Replacing a worn or leaking pipe is essential to prevent overheating and engine damage.
Why You May Need to Replace This Pipe
Prevent Engine Overheating
A properly functioning feed pipe ensures reliable coolant circulation.
Fix Coolant Leaks
Replacing damaged pipes restores system pressure and eliminates leaks.
Maintain Cooling System Efficiency
Ensures optimal heat transfer and engine performance.
Essential Preventative Maintenance
Cooling system components should be inspected and replaced as they age.
Direct Fit Replacement
Designed to match original Porsche specifications for correct fitment.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710662204
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Fits:
Porsche 987 Boxster / S MKI & MKII 2005>>
Porsche 987C Cayman / S MKI & MKII 2006>>
Porsche 997 GT3 2007-2010
Porsche 997 Carrera 2/2S MKI & MKII 2005>> CABRIO/COUPE
This product supersedes Porsche's old part numbers:
- 997 106 622 03
Diagram ref no 10
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710662204
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12

Fits:
Porsche 987 Boxster / S MKI & MKII 2005>>
Porsche 987C Cayman / S MKI & MKII 2006>>
Porsche 997 Carrera 2/2S MKI & MKII 2005>> CABRIO/COUPE
Click "Zoom in" to see the diagram.
Diagram ref no 27.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710690200
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
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oil pump, tandem pump for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE / CABRIO 2005-08 104-00
-
water pump and thermostat housing for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-00
-
lines heating I480 (6-speed manual transmission) for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-03
-
lines heating I249 (Tiptronic transmission) for 997.1 M97.01 3.6L COUPE / CABRIO and 997.1 M96.05 3.8L COUPE S / CABRIO S 2005-08 105-04
-
water cooling - 1 - for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-05
-
water cooling - 2 - for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-10
-
water cooling - 3 - for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-15
-
radiator centre I249 (Tiptronic transmission) for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-17
-
water cooling - 4 - for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-20
-
water cooling - 1 - for 997.1 TURBO 2007-09 105-05
-
water cooling - 2 - for 997.1 TURBO/GT2 M97.70 2007-09 and 997.1 GT2 RS M97.70 2011 105-10
-
water cooling - 1 - for 997 GT3 M97.76 2007-09 105-05
-
water cooling - 1 - for 997 GT3 / GT3 RS M97.77 2010-11 and 997 GT3 RS 4.0 M97.74 2011 105-06
-
water cooling - 2 - for 997 GT3 M97.76 2007-09 105-10
-
water cooling - 3 - for 997 GT3 M97.76 2007-09 105-15
-
water cooling - 3 - for 997 GT3 / GT3 RS M97.77 2010-11 and 997 GT3 RS 4.0 2011 105-16
-
radiator centre 997 GT3 M97.76 2007-09 105-17
-
radiator centre 997 GT3 / GT3 RS M97.77 2010-11 and 997 GT3 RS 4.0 M97.74 2011 105-18
High-Quality Coolant Hoses & Pipes for Reliable Engine Cooling and Temperature Control
Coolant hoses and pipes are essential components in the engine’s cooling system, responsible for circulating coolant between the radiator, water pump, thermostat housing and engine block. These hoses must withstand constant temperature fluctuations, pressure changes and exposure to coolant chemicals. A reliable coolant line system ensures stable engine temperatures, prevents overheating and protects internal engine components from heat-related damage.
Whether restoring a classic, repairing leaks or upgrading to more durable materials, replacing old coolant hoses and pipes is critical for maintaining consistent cooling performance.
What Coolant Hoses & Pipes Do
Coolant hoses and pipes perform multiple key functions:
- Transport coolant throughout the engine cooling circuit
- Maintain
stable engine temperature during all driving conditions
- Absorb
vibration and engine movement to prevent leaks
- Channel
coolant between major components including radiator, heater core and
expansion tank
- Support
proper thermostat operation by ensuring consistent flow
- Prevent overheating during high-load driving or hot climates
Without dependable hoses and pipes, the cooling system cannot maintain correct operating temperatures.
Why Coolant Hoses & Pipes Commonly Fail
Because they are exposed to heat, pressure and chemical
corrosion, coolant hoses and pipes naturally degrade over time. Common causes
of failure include:
- Cracking
or hardening due to prolonged heat cycling
- Swelling
or soft spots caused by chemical breakdown
- Corrosion
inside metal coolant pipes
- Leaks from worn hose clamps or fittings
- Abrasion
damage from rubbing against engine components
- Internal
collapse, restricting coolant flow
- Age-related deterioration in rubber or plastic hoses
Symptoms may include visible coolant leaks, overheating, steam from under the bonnet, fluctuating temperature gauge or a sweet coolant smell.
Why You Should Replace Worn Coolant Hoses & Pipes
Replacing aged or damaged hoses with high-quality, precision-built alternatives designed to match original cooling performance ensures your engine stays safe, efficient and protected from heat-related failure.
Benefits include:
- Restored coolant flow and stable operating temperatures
- Reduced risk of overheating and head gasket damage
- Improved reliability during long-distance or high-performance driving
- Better pressure resistance and durability with upgraded materials
- Prevention of sudden coolant loss or breakdowns
- Longer service life for the entire cooling system
Upgrading to reinforced hoses or corrosion-resistant pipes can also enhance long-term cooling system performance.