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Coolant Hoses and Pipes (Rear engine cars)

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DISPLAYING 1 to 16 (of 81 products)
1 2 3 4 >>
99710683103/1KIT
Product Information
Product Information
Coolant hose & oil pump connecting flange
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Related, superseded, cross reference or alternative numbers for comparison.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
99710683103
99710683102
99610683101
99710621600

The product you are viewing cross references to these numbers
WATERPIPEKIT03
Product Information
Product Information
Radiator pipes replacement kit. It's a common problem with 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

porsche

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
99710672803
99710662403
99710662303
99710662703
99710672307
99710672003
99710671103
99710675104
99710675204

The product you are viewing cross references to these numbers
WATERPIPEKIT05
Product Information
Product Information
Radiator pipes replacement kit.

oematch

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
99710672803
99710662403
99710662303
99710662703
99710672307
99710672003
99710671103
99710675104
99710675204
99710655103

The product you are viewing cross references to these numbers
RADANDPIPEKIT997.OEM
Product Information
Product Information
Radiators and pipes replacement kit.

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
99710672803
99710662403
99710662303
99710662703
99710672307
99710672003
99710671103
99710675104
99710675204
99710655103
99710613102
99710613202

The product you are viewing cross references to these numbers
RADANDPIPEKIT997.OE
Product Information
Product Information
Radiators and pipes replacement kit.

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
99710672803
99710662403
99710662303
99710662703
99710672307
99710672003
99710671103
99710675104
99710675204
99710655103
99710613102
99710613202

The product you are viewing cross references to these numbers
90037801301/1::1
Product Information
Product Information
Hex head bolt M6x25 with various applications
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
90037801301
90037801309

The product you are viewing cross references to these numbers
Special Order item
90037801301::1
Product Information
Product Information
Hex head bolt M6x25 with various applications
Sold each

porsche

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
90037801301
90037801309

The product you are viewing cross references to these numbers
Special Order item
99710625101
Product Information
Product Information
Breather hose - Coolant expansion tank.

porsche

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
99710625101
99710625100

The product you are viewing cross references to these numbers
99710625101/1
Product Information
Product Information
Breather hose - Coolant expansion tank.

oematch

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
99710625101
99710625100

The product you are viewing cross references to these numbers
Special Order item
99710655103
Product Information
Product Information
Connector sleeve. Porsche 987 Boxster / 987C Cayman / 997. Need 2 of these, one for each side 

porsche

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
99710655103

The product you are viewing cross references to these numbers
99710655103/1
Product Information
Product Information
Connector sleeve. Porsche 987 Boxster / 987C Cayman / 997   Need 2 of these one for each side 

oematch

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
99710655103
997.106.551.03

The product you are viewing cross references to these numbers
Special Order item
99710662105
Product Information
Product Information
Coolant Bottom Hose Supply LEFT.
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
99710662105
99710662103
99710662104

The product you are viewing cross references to these numbers
99710662105/1
Product Information
Product Information

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
99710662105
99710662103
99710662104

The product you are viewing cross references to these numbers
99710662204/1
Product Information
Product Information

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
99710662204
99710662203

The product you are viewing cross references to these numbers
Special Order item
99710662204
Product Information
Product Information
Coolant Bottom  Hose Supply - RIGHT.

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
99710662204
99710662203

The product you are viewing cross references to these numbers
Special Order item
99710690200
Product Information
Product Information
Coolant Hose Clamp.

porsche

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
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99710690200
99710690200

The product you are viewing cross references to these numbers
DISPLAYING 1 to 16 (of 81 products)
1 2 3 4 >>
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About Coolant Hoses and Pipes (Rear engine cars)

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.

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