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Porsche Boxster 986/987/981 (1997-2016) Engine Cooling Coolant Hoses and Pipes (Rear engine cars)

Coolant Hoses - Engine Bay

Coolant Hoses - Engine Bay

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DISPLAYING 17 to 32 (of 67 products)
1 2 3 4 >>
Engine coolant breather hose. Porsche 987.1 Boxster / 987C.1 Cayman - 98710653101
5
Engine coolant breather hose. Porsche 987.1 Boxster / 987C.1 Cayman
98710653101/1
Product Information
Product Information
Engine coolant breather hose.

Fits:
Porsche 987.1 Boxster 2005-08
Porsche 987C.1 Cayman 2006-08

Click 'Zoom in' for large parts diagram.
Diagram ref no 26

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98710653101
98710653101

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Engine coolant hose, return. Porsche 997.2 / 981 Boxster / 981C Cayman - 9A110661501, 9A110661500
5
Engine coolant hose, return. Porsche 997.2 / 981 Boxster / 981C Cayman
Special Order item
9A110661501
Product Information
Product Information
Engine coolant hose, return.

Fits:
Porsche 987.2 Boxster 2.9L / 3.4L 2009-12
Porsche 981C.2 Cayman 2.9L / 3.4L 2009-12
Porsche 997.2 Carrera 2009-12
Porsche 991.1 Carrera 2012-16

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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9A110661501
9A110661501
9A110661500

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Engine coolant hose, return. Porsche 997.2 / 981 Boxster / 981C Cayman - 9A110661501, 9A110661500
3
Engine coolant hose, return. Porsche 997.2 / 981 Boxster / 981C Cayman
9A110661501/1
Product Information
Product Information
Engine coolant hose - Return

Fits:
Porsche 987.2 Boxster 2.9ltr / 3.4ltr - 2009 to 2012
Porsche 981C.2 Cayman 2.9ltr / 3.4ltr - 2009 to 2012
Porsche 997.2 Carrera - 2009 to 2012
Porsche 991.1 Carrera - 2012 to 2016

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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9A110661501
9A110661501
9A110661500

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Engine coolant hose. Porsche 987.2 Boxster / 987C.2 Cayman - 9A110666031, 9A110666030
4
Engine coolant hose. Porsche 987.2 Boxster / 987C.2 Cayman
Special Order item
9A110666031
Product Information
Product Information
Engine coolant hose, feed.

Fits:
Porsche 987.2  Boxster 2.9L / 3.4L 2009-12
Porsche 987C.2  Cayman 2.9L / 3.4L 2009-12

Click 'Zoom in' for large parts diagram.
Diagram ref no 15

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9A110666031
9A110666031
9A110666030

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Engine Coolant Inlet Flange Drain Plug. Porsche 981 / 982 / 987.2 / 991.1 / 991.2 / 992.1 / 992.2 / 997.2 - 0PB121099, 9A110654600
3
Engine Coolant Inlet Flange Drain Plug. Porsche 981 / 982 / 987.2 / 991.1 / 991.2 / 992.1 / 992.2 / 997.2
Special Order item
0PB121099
Product Information
Product Information
Engine Coolant Inlet Flange Drain Plug.
Sold Each.
x3 Required Per Car.

Fits:
Porsche 981 Boxster 2012>>2016
Porsche 981 Cayman 2014>>2016
Porsche 981 Boxster Spyder 2016>>2016
Porsche 982 Boxster GTS (718) 4.0L 2017>>
Porsche 982 Cayman GTS (718) 4.0L 2017>>
Porsche 982 Boxster Spyder (718) 2019>>
Porsche 987.2 Boxster MKII 2009>>2012
Porsche 987.2 Cayman MKII 2009>>2012
Porsche 991.1 Carrera MKI 2012>>2016
Porsche 991.2 Carrera MKII 2017>>2019
Porsche 991 Turbo / Turbo S / GT2 RS MKI / MKII 2014>>2020
Porsche 992.1 Carrera MKI 2019>>2024
Porsche 992.2 Carrera 2 3.0L MKII 2024>>
Porsche 992.1 Turbo / Turbo S MKI 2020>>
Porsche 997.2 Carrera MKII 2009>>2012
Porsche 997.2 Turbo / GT2 RS MKII 2010>>2013
Porsche 981 Cayman GT4 2016>>2016
Porsche 982 Cayman GT4 (718) 2019>>

Diagram Ref No 16

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0PB121099
0PB121099
9A110654600

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Heater hose. Porsche 987.2 Boxster / Cayman 2009-12 - 98710621230
2
Heater hose. Porsche 987.2 Boxster / Cayman 2009-12
Special Order item
98710621230
Product Information
Product Information

Heater Hose – Porsche 987.2 Boxster / Cayman 2009–2012 – 98710621230

This replacement heater hose is designed for the cooling and cabin heating system. It carries engine coolant through the heater circuit, helping maintain reliable cabin heating and correct coolant circulation.

Fits

  • Porsche 987.2 Boxster 2.9L 2009–12.
  • Porsche 987.2 Boxster S 3.4L 2009–12.
  • Porsche 987C.2 Cayman 2.9L 2009–12.
  • Porsche 987C.2 Cayman S / Cayman R 3.4L 2009–12.

Diagram Ref No 19

What This Product Does

This hose provides a coolant connection within the heating circuit. Its role is to convey coolant through the connected system, allowing circulation associated with cabin heating. Although shown alongside the expansion tank and associated fittings, the supplied component is a hose, not a coolant reservoir.

Functions

  • Conveys coolant within the heater circuit.
  • Provides a connection between adjoining components.
  • Contains coolant along the hose connection when correctly installed.

Technical Details

  • Genuine Porsche component, part number 98710621230.
  • Diagram description: Heating hose.
  • Listed diagram quantity: 1.
  • Diagram application codes: A120, A121.
  • Applications include the supplied 987 MKII Boxster and 987C MKII Cayman variants.
  • Shown in the coolant-system assemblies for 987.2 Boxster / Boxster S and 987C.2 Cayman 2.9L / 3.4L, 2009–12.

Symptoms of Fault

  • Damp patches or dried deposits at hose joints.
  • A coolant odour following use.
  • Coolant level dropping repeatedly or a low-level warning.
  • Splits, swelling or hardened sections visible during inspection.
  • Abnormally high coolant temperature or escaping steam.
  • Weak cabin heating associated with insufficient coolant or trapped air.

These signs can have other cooling-system causes; inspect the hose and neighbouring connections before deciding which component needs replacement.

Why Replacement Matters

Repeated heating, internal pressure and movement can gradually degrade a coolant hose. Renewing a confirmed leaking or damaged component addresses the defective connection rather than relying on repeated coolant top-ups. Examine adjoining fittings, clamps and other hoses for deterioration while carrying out the repair. Follow the applicable Porsche workshop instructions for filling and bleeding after installation.

FAQs

Can leakage appear only after driving?
A small defect may become apparent as coolant temperature and system pressure increase, even if the connection appears dry during a cold inspection.

Do nearby connections need checking?
Inspect the mating fittings and clamps as well as the hose. Deposits around a joint do not establish which individual component is responsible.

How can slight coolant seepage be traced?
Pressure testing can help locate a leak that is difficult to identify visually.



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98710621230
98710621230

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Oil and Coolant Filler Cup Cover. Porsche Boxster 987.1 / 987.2 - 98710618000
2
Oil and Coolant Filler Cup Cover. Porsche Boxster 987.1 / 987.2
Special Order item
98710618000
Product Information
Product Information
Oil and Coolant Filler Cup Cover.

Fits:
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2005-08

Porsche 987 Gen 2 Boxster 2009-12
Porsche 987C Gen 2 Cayman 2009-12

Click 'Zoom in' for large parts diagram.
Diagram ref no 2

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98710618000
98710618000

The product you are viewing cross references to these numbers
Oil And Coolant Filler Cup. Porsche Boxster 987.1 / 987.2 / Boxster / Cayman 2005-12 - 98710615002
3
Oil And Coolant Filler Cup. Porsche Boxster 987.1 / 987.2 / Boxster / Cayman 2005-12
Special Order item
98710615002
Product Information
Product Information
Oil And Coolant Filler Cup.
Oil And Coolant Caps With Seals Included.


Fits:
Porsche 987.1 Boxster MKI 2005>>2008
Porsche 987.2 Boxster MKII 2009>>2012
Porsche 987.1 Cayman MKI 2005>>2008
Porsche 987.2 Cayman MKII 2009>>2012

Diagram Ref No 1 (Diagram Ref No 3, 4, 5 And 6 Included)



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98710615002
98710615002

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O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991 - 99610680103
9
O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991
Special Order item
99610680103
Product Information
Product Information
O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12

Porsche 981 Boxster 2012-16 
Porsche 981 Boxster Spyder 2016 
Porsche 981 Cayman 2014-16 
Porsche 981 Cayman GT4 2016 

Porsche 718 (982) Boxster 2017>> 
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>

Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

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99610680103
99610680103

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O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991 - 99610680103 - ORS161125
9
O-Ring for Cooling System (46.7x3.53) - Several Applications. Porsche 987 / 981 / 718 / 996 / 997 / 991
99610680103/1
Product Information
Product Information
O-ring – 46.7 x 3.53 – used in various applications within the car's cooling system.

Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12

Porsche 981 Boxster 2012-16 
Porsche 981 Boxster Spyder 2016 
Porsche 981 Cayman 2014-16 
Porsche 981 Cayman GT4 2016 

Porsche 718 (982) Boxster 2017>> 
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>

Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05

Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11

Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21

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99610680103
99610680103

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Regulating valve water cooling. Porsche 981 / 718 / 997.2 / 991 - 9P1317233, 99130757300
4
Regulating valve water cooling. Porsche 981 / 718 / 997.2 / 991
Special Order item
9P1317233
Product Information
Product Information
Regulating valve water cooling. 

Fits:
Porsche 981 Boxster - 2012 to 2016
Porsche 981 Cayman - 2013 to 2016
Porsche 718 Boxster - 2017 Onwards
Porsche 718 Cayman - 2017 Onwards
Porsche 997.2 - 2009 to 2012
Porsche 991 - 2012 to 2019

Click 'Zoom in' for large parts diagram.
Diagram ref no 4


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9P1317233
9P1317233
99130757300

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Regulating Valve Water Cooling. Porsche 981 / 718 / 997.2 / 991 - 9P1317233, 99130757300 - 173433
3
Regulating Valve Water Cooling. Porsche 981 / 718 / 997.2 / 991
9P1317233/1
Product Information
Product Information
Regulating Valve Water Cooling.
This Regulating Valve Water Cooling is a OE MATCH Porsche component designed to control and regulate coolant flow within the engine’s water cooling system. Acting as a precision valve within the cooling circuit, it ensures that coolant is directed appropriately to maintain optimal engine operating temperatures under varying conditions.

Fits:
  • Porsche Boxster 981 2.7L 2012-16
  • Porsche Boxster 981 S / GTS 3.4L 2012-16
  • Porsche Boxster 981 Spyder 3.8L 2016
  • Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
  • Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
  • Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
  • Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
  • Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
  • Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
  • Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
  • Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
  • Porsche Boxster Spyder / Sypder RS 718 4.0L 01/2019>>
  • Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp) 01/2020>>
  • Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
  • 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 2010-11
  • Porsche 997 MKII Turbo 2010-13
  • Porsche 997 MKII GT2 RS 2011-13
  • Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
  • Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
  • Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
  • Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
  • Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
  • Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
  • Porsche 991.1 R 4.0L (500 Bhp) 2016
  • Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
  • Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
  • Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
  • Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19
  • Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
  • Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
  • Porsche 991.2 Speedster 4.0L (510Bhp) 2019
  • Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
  • Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
  • Porsche Cayman 2.7L 981 2013-16
  • Porsche Cayman S / GTS 3.4L 981 2013-16
  • Porsche Cayman GT4 3.8L 2015-16
  • Porsche Cayman 718 2.0L Manual (300 Bhp)
  • Porsche Cayman 718 2.0L PDK (300 Bhp)
  • Porsche Cayman S 718 2.5L Manual (350 Bhp)
  • Porsche Cayman S 718 2.5L PDK (350 Bhp)
  • Porsche Cayman T 718 2.0L Manual (300 Bhp)
  • Porsche Cayman T 718 2.0L PDK (300 Bhp)
  • Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
  • Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
  • Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
  • Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
  • Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L  

Diagram Ref No 4

What This Product Does:
  • Regulates coolant flow within the engine cooling system
  • Maintains optimal engine temperature under all driving conditions
  • Directs coolant to different circuits as required
  • Supports efficient engine warm-up and cooling
  • Works with thermostats and other cooling components to balance system performance     


Symptoms Of Wear Or Failure:

  • Engine overheating or temperature fluctuations
  • Engine running too cool (inefficient operation)
  • Coolant leaks around the valve housing
  • Poor heater performance or inconsistent cabin temperature
  • Check engine light related to cooling system faults
  • Reduced engine efficiency due to improper temperature control  

Why Replacement Matters:
  • Restores proper coolant flow and temperature control
  • Prevents overheating and potential engine damage
  • Ensures optimal engine efficiency and fuel economy
  • Protects cooling system components from excessive stress
  • Maintains reliable operation of both engine and heating systems  



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

9P1317233
9P1317233
99130757300

The product you are viewing cross references to these numbers
Vent hose water coolant. Porsche 986 Boxster - 99610613504, 99610613502, 99610613501
4
Vent hose water coolant. Porsche 986 Boxster
Special Order item
99610613504
Product Information
Product Information
Vent hose water coolant.

Fits:
Porsche 986 Boxster - 1997 to 2004
Porsche 986 Boxster S - 1997 to 2004

Diagram ref no 6
 

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99610613504
99610613504
99610613502
99610613501

The product you are viewing cross references to these numbers
Water coolant hose feed. Porsche 986 Boxster / 987 Boxster / Cayman - 99610621211, 99610621209, 99610621203, 99610621204
4
Water coolant hose feed. Porsche 986 Boxster / 987 Boxster / Cayman
Special Order item
99610621211
Product Information
Product Information
Water coolant hose feed. Porsche 986 Boxster / 987 Boxster / Cayman

Fits:
Porsche 986 Boxster (manual) - 1997 to 2004
Porsche 987 Boxster (manual) - 2005 to 2008
Porsche 987 Cayman (manual) - 2005 to 2008

Click 'Zoom in' for large parts diagram.
Diagram ref no 5



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99610621211
99610621211
99610621209
99610621203
99610621204

The product you are viewing cross references to these numbers
Water coolant hose feed. Porsche 986 Boxster / 987 Boxster / Cayman - 99610621211, 99610621209, 99610621203, 99610621204
3
Water coolant hose feed. Porsche 986 Boxster / 987 Boxster / Cayman
99610621211/1
Product Information
Product Information
Water coolant hose feed. Porsche 986 Boxster / 987 Boxster / Cayman

Fits:
Porsche 986 Boxster (manual) - 1997 to 2004
Porsche 987 Boxster (manual) - 2005 to 2008
Porsche 987 Cayman (manual) - 2005 to 2008

Click 'Zoom in' for large parts diagram.
Diagram ref no 5



Related reference numbers
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99610621211
99610621211
99610621209
99610621203
99610621204

The product you are viewing cross references to these numbers
Water Coolant Hose For Expansion Tank. Porsche 987 Boxster / Cayman 2005-12 - 98710627002
3
Water Coolant Hose For Expansion Tank. Porsche 987 Boxster / Cayman 2005-12
98710627002/1
Product Information
Product Information
Water Coolant Hose For Expansion Tank. 

Fits:
Porsche 987.1 Boxster / Boxster S 2005>>2008
Porsche 987.2 Boxster / Boxster S 2009>>2012
Porsche 987.1 Cayman / Cayman S 2006>>2008
Porsche 987.2 Cayman / Cayman S 2009>>2012

Diagram Ref No 10



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98710627002
98710627002

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DISPLAYING 17 to 32 (of 67 products)
1 2 3 4 >>
Also found on these pages
About Coolant Hoses - Engine Bay

Coolant Hoses – Engine Bay | Reliable Cooling for Peak Porsche Performance

Coolant hoses in the engine bay are critical components that circulate coolant between the radiator, water pump, and engine block — maintaining consistent operating temperatures and preventing overheating. These hoses carry coolant through high-pressure, high-temperature zones within the engine bay, ensuring your Porsche performs at its best, even under demanding conditions.

At Design911, we stock a wide range of genuine and manufacturer-quality engine bay coolant hoses for Porsche models including 911, Boxster, Cayman. Each hose is designed to fit perfectly, resist extreme temperatures, and deliver long-lasting performance — matching the quality, precision and reliability.

What Do Engine Bay Coolant Hoses Do?

Coolant hoses form part of your Porsche’s closed-loop cooling system. Their job is to:

  • Circulate coolant between the engine, radiator, and water pump.
  • Maintain engine temperature for optimal performance and emissions.
  • Support consistent coolant pressure during operation.
  • Prevent engine overheating and protect internal components from heat damage.

In high-performance engines, such as those found in Porsche vehicles, properly functioning hoses are essential for ensuring precise temperature control and long-term mechanical integrity.

Why Do Engine Bay Coolant Hoses Fail?

Over time, coolant hoses endure constant exposure to heat, vibration, and pressure, which can cause wear and eventual failure. Common causes include:

  • Rubber deterioration from heat cycling and coolant chemicals.
  • Cracking or hardening due to age and environmental factors.
  • Swelling or soft spots from internal coolant corrosion.
  • Leaks at connections caused by weakened hose ends or clamps.
  • Abrasion or rubbing against other engine components.

Symptoms of failure include coolant leaks, overheating, fluctuating temperature readings, or a noticeable smell of coolant in the engine bay.

Why Replace Faulty Coolant Hoses?

A damaged or leaking hose can cause rapid coolant loss and severe engine overheating. Replacing worn hoses ensures your Porsche’s cooling system functions reliably and efficiently.

Benefits of replacement include:

  • Restored coolant circulation and temperature control.
  • Prevention of leaks, overheating, and potential engine damage.
  • Improved reliability and performance under all driving conditions.
  • Manufacturer-quality construction and perfect fitment.

All hoses in this range are built using reinforced, high-grade rubber compounds designed to withstand extreme heat, pressure, and vibration — ensuring lasting durability and peace of mind.

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