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Porsche // 997 (911) MK1 2005-2008 // Any
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Cooling Water Tube - Return Line Porsche 997 MKII - 99710680902
99710680902
Vehicle Group
- 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 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 Turbo 2010-13
Information
Cooling Water Tube - Return Line.
Fits:
Porsche 997 MKI Carrera All.
997 Carrera 2 3.6L 2005>>
997 Carrera 2S 3.8L 2005>>
997 Carrera 4 3.6L 2005>>
997 Carrera 4S 3.8L 2005>>
Porsche 997 MKI Turbo
Porsche 997 MKII Carrera All. 2009>>
997 Carrera 2 3.6L 2009>>
997 Carrera 2S 3.8L 2009>>
997 Carrera 4 3.6L 2009>>
997 Carrera 4S 3.8L 2009>>
Porsche 997 MKII Turbo 2009>>
Diagram Ref no 7
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710680902
The product you are viewing cross references to these numbers
Fits:
Porsche 997 MKI Carrera All.
997 Carrera 2 3.6L 2005>>
997 Carrera 2S 3.8L 2005>>
997 Carrera 4 3.6L 2005>>
997 Carrera 4S 3.8L 2005>>
Porsche 997 MKI Turbo
Porsche 997 MKII Carrera All. 2009>>
997 Carrera 2 3.6L 2009>>
997 Carrera 2S 3.8L 2009>>
997 Carrera 4 3.6L 2009>>
997 Carrera 4S 3.8L 2009>>
Porsche 997 MKII Turbo 2009>>
Diagram Ref no 7
Related reference numbers
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99710680902
99710680901
99710680902
99710680900
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Price: £119.16
In stock
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Vehicle Group
- 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
Information
Water Pump Inlet Hose. Runs from the upper left side of the engine bay to the water pump.
Fits:
Porsche 997 C2/C2S/C4/C4S 2005-08
Click 'Zoom in' for large parts diagram.
Diagram ref no 10
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710685001
The product you are viewing cross references to these numbers
Fits:
Porsche 997 C2/C2S/C4/C4S 2005-08
Click 'Zoom in' for large parts diagram.
Diagram ref no 10
Related reference numbers
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99710685001
99710685001
The product you are viewing cross references to these numbers
Price: £145.45
Arriving soon
Vehicle Group
- 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
Information
Coolant Return Hose, Return hose at the thermostat housing.
This original Porsche coolant hose forms part of the engine cooling system, helping return coolant through the cooling circuit and maintain correct engine operating temperature.
Fits:
Porsche 997.1 C2 / C2S 2005 - 2008
Porsche 997.1 C4 / C4S 2005 - 2008
Diagram ref no 15
This hose is used in the water pump / thermostat housing area on selected Porsche 997.1 models.
What This Part Does / Functions:
• Routes coolant through the return side of the cooling system
• Connects at the thermostat housing area where specified
• Helps maintain correct coolant circulation and engine temperature control
• Supports proper cooling system pressure and flow
• Replaces a cracked, swollen, leaking or heat-damaged original hose
• Helps prevent coolant loss and overheating risk
• Provides correct Genuine Porsche hose shape, material and connection fitment
• Supports reliable factory cooling system performance.
Why Replace This Part?
Coolant hoses are exposed to heat cycles, coolant pressure, engine bay temperatures, vibration and age-related rubber deterioration. Over time, the hose can harden, swell, crack, split or leak. A failing coolant return hose may cause coolant loss, low coolant warnings, overheating risk or visible coolant residue around the thermostat housing.
Replacing it with a Genuine Porsche coolant return hose helps restore the correct factory coolant routing and reliable cooling system sealing.
Common Symptoms of a Faulty Coolant Return Hose
• Coolant leak around the thermostat housing
• Dried coolant residue around the hose connections
• Low coolant warning
• Coolant smell from the rear engine bay
• Engine temperature rising above normal
• Hose swelling, cracking or softening
• Cooling system pressure loss
• Damage found during cooling system inspection.
When to Replace This Part
• If the original hose is cracked, swollen, leaking or damaged
• During thermostat housing or water pump service
• During cooling system overhaul
• When replacing related coolant pipes, hoses or clamps
• If coolant loss is traced to the return hose
• After engine bay service where the hose has been disturbed
• If the hose has become brittle, soft or oil-contaminated
Where It Fits on the Car
This hose fits in the engine cooling / water cooling system at the thermostat housing area. It is identified as the coolant return hose / water hose return line and is shown in Porsche cooling diagrams as diagram reference no. 15.
Correct routing, clamp positioning and sealing are important to prevent coolant leaks and maintain proper cooling system operation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710683204
The product you are viewing cross references to these numbers
This original Porsche coolant hose forms part of the engine cooling system, helping return coolant through the cooling circuit and maintain correct engine operating temperature.
Fits:
Porsche 997.1 C2 / C2S 2005 - 2008
Porsche 997.1 C4 / C4S 2005 - 2008
Diagram ref no 15
This hose is used in the water pump / thermostat housing area on selected Porsche 997.1 models.
What This Part Does / Functions:
• Routes coolant through the return side of the cooling system
• Connects at the thermostat housing area where specified
• Helps maintain correct coolant circulation and engine temperature control
• Supports proper cooling system pressure and flow
• Replaces a cracked, swollen, leaking or heat-damaged original hose
• Helps prevent coolant loss and overheating risk
• Provides correct Genuine Porsche hose shape, material and connection fitment
• Supports reliable factory cooling system performance.
Why Replace This Part?
Coolant hoses are exposed to heat cycles, coolant pressure, engine bay temperatures, vibration and age-related rubber deterioration. Over time, the hose can harden, swell, crack, split or leak. A failing coolant return hose may cause coolant loss, low coolant warnings, overheating risk or visible coolant residue around the thermostat housing.
Replacing it with a Genuine Porsche coolant return hose helps restore the correct factory coolant routing and reliable cooling system sealing.
Common Symptoms of a Faulty Coolant Return Hose
• Coolant leak around the thermostat housing
• Dried coolant residue around the hose connections
• Low coolant warning
• Coolant smell from the rear engine bay
• Engine temperature rising above normal
• Hose swelling, cracking or softening
• Cooling system pressure loss
• Damage found during cooling system inspection.
When to Replace This Part
• If the original hose is cracked, swollen, leaking or damaged
• During thermostat housing or water pump service
• During cooling system overhaul
• When replacing related coolant pipes, hoses or clamps
• If coolant loss is traced to the return hose
• After engine bay service where the hose has been disturbed
• If the hose has become brittle, soft or oil-contaminated
Where It Fits on the Car
This hose fits in the engine cooling / water cooling system at the thermostat housing area. It is identified as the coolant return hose / water hose return line and is shown in Porsche cooling diagrams as diagram reference no. 15.
Correct routing, clamp positioning and sealing are important to prevent coolant leaks and maintain proper cooling system operation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710683204
99710683204
99710683203
The product you are viewing cross references to these numbers
Price: £70.07
In stock
Vehicle Group
- 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
Information
Water Coolant Pipe, Supply.
Fits:
Porsche 997.1 2005-08
Porsche 997.2 2009-12
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Related reference numbers
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99710661032
99710661032
99710661001
99710661000
99710661031
The product you are viewing cross references to these numbers
Price: £273.13
In stock
Vehicle Group
- 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
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Information
Heater hose - Engine to return line.
Genuine Porsche Original Equipment (OE) heater coolant return hose that connects between the engine cooling circuit and the heater return line, ensuring proper coolant flow through the heater core and back to the engine cooling system.
Fits:
Porsche 996 Carrera 2002 - 2005 Tiptronic Gearbox only
Porsche 997.1 3.6L / 3.8L 2004 - 2008
Porsche 997.1 Turbo / GT2 2007 - 2009
Porsche 997.2 Turbo / GT2 RS 2010 - 2013
Porsche 997 GT3 3.8 / 4.0 2009 - 2011
Diagram ref no 42
This hose ensures an unobstructed and secure channel for coolant returning from the vehicle’s heater core to the engine cooling loop, playing a vital role in passenger cabin heating and overall engine thermal regulation. Its precise fit and correct routing are essential to avoid bypassing or pinching, which could otherwise lead to heater inefficiency or premature failure.
Installed between the heater core outlet and the engine’s return fitting, this hose:
• Transports heated coolant from the heater core back to the engine cooling system
• Maintains correct flow and pressure balance within the cooling circuit
• Operates under high temperatures and multiple thermal cycles
• Interfaces with factory-specified clamps and hose connections
Because it is made to OE specification, the hose ensures proper sealing and routing that matches the original Porsche design.
A cooling system hose that has become brittle, cracked, swollen, or porous can leak or restrict flow, leading to reduced heating performance, coolant loss, and potential engine overheating. Because the heater return hose carries pressurised coolant across temperature extremes, degradation over time is typical. Replacing it with a Genuine Porsche OE part ensures correct material performance and sealing, helping preserve cooling efficiency and prevent unexpected failures.
When to replace:
• Visible cracks, swelling, or soft spots
• Coolant leaks around the hose ends
• Heater blowing cold air, indicating poor coolant flow
• Cooling system overhaul or heater core service
• Preventive maintenance on high-mile vehicles
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610622275
The product you are viewing cross references to these numbers
Genuine Porsche Original Equipment (OE) heater coolant return hose that connects between the engine cooling circuit and the heater return line, ensuring proper coolant flow through the heater core and back to the engine cooling system.
Fits:
Porsche 996 Carrera 2002 - 2005 Tiptronic Gearbox only
Porsche 997.1 3.6L / 3.8L 2004 - 2008
Porsche 997.1 Turbo / GT2 2007 - 2009
Porsche 997.2 Turbo / GT2 RS 2010 - 2013
Porsche 997 GT3 3.8 / 4.0 2009 - 2011
Diagram ref no 42
This hose ensures an unobstructed and secure channel for coolant returning from the vehicle’s heater core to the engine cooling loop, playing a vital role in passenger cabin heating and overall engine thermal regulation. Its precise fit and correct routing are essential to avoid bypassing or pinching, which could otherwise lead to heater inefficiency or premature failure.
Installed between the heater core outlet and the engine’s return fitting, this hose:
• Transports heated coolant from the heater core back to the engine cooling system
• Maintains correct flow and pressure balance within the cooling circuit
• Operates under high temperatures and multiple thermal cycles
• Interfaces with factory-specified clamps and hose connections
Because it is made to OE specification, the hose ensures proper sealing and routing that matches the original Porsche design.
A cooling system hose that has become brittle, cracked, swollen, or porous can leak or restrict flow, leading to reduced heating performance, coolant loss, and potential engine overheating. Because the heater return hose carries pressurised coolant across temperature extremes, degradation over time is typical. Replacing it with a Genuine Porsche OE part ensures correct material performance and sealing, helping preserve cooling efficiency and prevent unexpected failures.
When to replace:
• Visible cracks, swelling, or soft spots
• Coolant leaks around the hose ends
• Heater blowing cold air, indicating poor coolant flow
• Cooling system overhaul or heater core service
• Preventive maintenance on high-mile vehicles
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610622275
99610622275
99610622274
99610622265
99610622266
99610622257
99610622256
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Price: £21.93
In stock