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Coolant Hoses - Engine Bay

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DISPLAYING 1 to 16 (of 18 products)
1 2
Special Order item
98710667400
Product Information
Product Information
Coolant pipe, feed.
Gear oil cooler.

porsche

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

Click 'Zoom in' for large parts diagram.
Diagram ref no 11

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98710667400
98710667400

The product you are viewing cross references to these numbers
Special Order item
98710653101
Product Information
Product Information
Engine coolant breather hose.

porsche

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

The product you are viewing cross references to these numbers
98710653101/1
Product Information
Product Information
Engine coolant breather hose.

oematch

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

The product you are viewing cross references to these numbers
Special Order item
98710618000
Product Information
Product Information
Oil and Coolant Filler Cup Cover.

porsche

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
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

The product you are viewing cross references to these numbers
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

The product you are viewing cross references to these numbers
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

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

porsche

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
99610621211/1
Product Information
Product Information
Water coolant hose feed. Porsche 986 Boxster / 987 Boxster / Cayman

oematch

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
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

The product you are viewing cross references to these numbers
Special Order item
98710627002
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

The product you are viewing cross references to these numbers
Special Order item
98710650804
Product Information
Product Information
Water Coolant Housing


porsche

Fits:
Porsche 987 Boxster 2.7L
Porsche 987 Boxster S 3.2L / 3.4L
Porsche 987C Cayman 2.7L
Porsche 987C Cayman S 3.4L

Click 'Zoom in' for large parts diagram.
Diagram ref no 29



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98710650804
98710650804

The product you are viewing cross references to these numbers
Special Order item
99610667201
Product Information
Product Information
Water Cooling Pipe, Tiptronic Transmission.
Restore proper coolant flow through your Porsche’s automatic transmission oil cooler circuit with this genuine OEM cooling pipe. Designed for models with rear-engine layout and automatic transmission, this pipe ensures proper coolant routing, prevents leaks and supports optimal engine/transmission temperature control.

Fits:
  • Porsche Boxster 986 2.7L 2000-02
  • Porsche Boxster S 986 3.2L 2000-02
  • 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 Cayman 2.7L 987C 2006-08
  • Porsche Cayman S 3.4L 987C 2005-08
Cars With Option Codes:
249 - Tiptronic Transmission

Diagram Ref No 15

What This Product Does:

  • The pipe directs coolant (engine coolant / water mixture) through the cooling system, often routing it through or around a transmission/automatic-gearbox oil cooler in vehicles with Tiptronic/automatic transmissions.
  • It helps regulate fluid temperature (coolant & possibly transmission oil) by providing proper coolant flow in the rear-engine bay area.
  • Maintaining correct coolant flow through this pipe ensures the engine/transmission oil cooler stays effective, temperatures remain controlled, and the vehicle’s cooling system functions safely.

Symptoms Of Wear, Damage Or Replacement Need:
  • Coolant leaks or drips in the rear of the engine bay where this pipe is located—looking for coolant residue, wetness, corrosion around the pipe connections.
  • Reduced cooling performance: If coolant isn’t flowing properly (for example if the pipe is cracked, collapsed internally or blocked), you might see higher than normal engine or transmission oil temperatures, especially under heavy load or sustained driving.
  • Visible damage, cracks, splits or heat/rubber deterioration (if part of the pipe has rubber sections or is routed near hot components) — Because rear-engine compartments get hot, pipes near the automatic trans oil cooler are subject to thermal/age stress.
  • During servicing: If you are already removing parts of the cooling system, oil cooler, or automatic transmission heat exchanger, and you notice the pipe is old, brittle or worn—replacing it while access is available prevents future failure.

Why Replacement Matters:
  • Cooling system integrity: This pipe is part of the critical route for coolant (and possibly transmission oil cooling). A failure or leak can reduce the cooler’s effectiveness, leading to elevated temperatures and increased wear or damage to the transmission or engine.
  • Prevention of bigger failures: A leaking or collapsed pipe may lead to coolant loss, cross-contamination, or overheating—which are much more serious and expensive to fix than replacing the pipe itself.



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

99610667201
99610667201

The product you are viewing cross references to these numbers
Special Order item
98710652202
Product Information
Product Information
Water hose return line.

porsche

Fits:
Porsche 987 Boxster 2005-08
Porsche 987C Cayman 2006-08

Click 'Zoom in' for large parts diagram.
Diagram ref no 8


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98710652202
98710652202
98710652201

The product you are viewing cross references to these numbers
Special Order item
98710650107
Product Information
Product Information
Water hose, Supply.

porsche

Fits:
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08

Click 'Zoom in' for large parts diagram.
Diagram ref no 1

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

98710650107
98710650107
98710650106

The product you are viewing cross references to these numbers
Special Order item
99610622217
Product Information
Product Information
Water hose. Return Line.

porsche

Fits:
Porsche 987 Boxster / Boxster S 2005-08 (I480 / I481)
Porsche 987c Cayman / Cayman S 2006-08 (I480)
Porsche 986 All manual 1997-2004 (I480) / (I481)

* I480 - 6-speed manual transmission
* I481 - 5th-speed manual transmission

This product supersedes Porsche's old part numbers:
- 996 106 222 15

Click "Zoom in" to see the diagram.
Diagram ref no 10.

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99610622217
99610622217

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DISPLAYING 1 to 16 (of 18 products)
1 2
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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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