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Coolant return water hose. Porsche 996 1998-01 3.4L C4 MANUAL - 99610674110
99610674110/1
Vehicle Group
- Porsche 996 C4 3.4L 1997-08/01
Information
Coolant Return Water Hose
Maintain the reliability and efficiency of your Porsche's
cooling system with this OE Match Coolant Return Water Hose. Manufactured for precise fitment and long-lasting
durability, this replacement hose restores the correct circulation of engine
coolant between key cooling system components, helping to regulate engine
temperature under all driving conditions.
Fits:
Diagram ref no 3
- Porsche 996 C4 3.4L 1997-08/01
Diagram ref no 3
The cooling system on the Porsche 996 is critical to
protecting the M96 engine from excessive heat. The coolant return hose carries
coolant back through the system after it has absorbed heat from the engine,
allowing it to be cooled by the radiators before recirculating. Over time, the
original hose is subjected to constant heat cycles, coolant pressure, vibration
and age, causing the rubber to harden, crack or weaken. If left unchecked, this
can result in coolant leaks, pressure loss and ultimately engine overheating.
Replacing ageing coolant hoses is an important part of preventative maintenance and is highly recommended during engine repairs, cooling system overhauls or whenever signs of deterioration become evident.
Manufactured to OE Match standards, this coolant return hose provides dependable sealing, excellent durability and factory-quality fitment for long-term reliability.
What Does the Coolant Return Water Hose Do?
The coolant return hose forms part of the engine's closed cooling system, allowing coolant to circulate efficiently between the engine and cooling components.
Its primary functions include:
- Returning coolant through the cooling circuit.
- Maintaining continuous coolant circulation.
- Helping regulate engine operating temperature.
- Supporting efficient heat transfer.
- Maintaining cooling system pressure.
- Preventing coolant loss from deteriorated hoses.
A correctly functioning coolant hose is essential for maintaining engine efficiency and preventing overheating.
Why Replace the Coolant Return Water Hose?
Rubber coolant hoses gradually deteriorate through exposure to heat, pressure and coolant chemicals.
Common reasons for replacement include:
- Cracked or perished rubber.
- Coolant leaks.
- Soft or swollen hose walls.
- Internal hose degradation.
- Cooling system pressure loss.
- Age-related deterioration.
- Cooling system refurbishment.
- Preventative maintenance.
Replacing worn hoses helps maintain the integrity of the cooling system and significantly reduces the risk of unexpected failures.
Symptoms of a Failing Coolant Hose
A deteriorating coolant return hose may cause:
- Visible coolant leaks.
- Sweet smell of coolant.
- Low coolant warning.
- Damp or stained hoses.
- Cooling system pressure loss.
- Rising engine temperature.
- Steam from the engine compartment.
- Risk of engine overheating.
Replacing the hose restores reliable coolant circulation and helps protect the engine from heat-related damage.
Benefits
- Restores cooling system efficiency.
- Helps prevent coolant loss.
- Supports stable engine operating temperatures.
- Reduces the risk of overheating.
- Straightforward direct replacement.
- Long-lasting, durable construction.
Whenever replacing coolant hoses, it is advisable to inspect the remaining coolant hoses, hose clips, thermostat, water pump, expansion tank and coolant pipe connections, as these components often age together and replacing them at the same time can help prevent future cooling system failures.
Why Choose OE Match Cooling System Components?
OE Match cooling system components are manufactured to deliver factory-quality fitment, dependable durability and reliable long-term performance. Designed specifically for Porsche applications, they help maintain the efficiency of the cooling system while protecting the engine from overheating. Whether you're repairing a coolant leak, carrying out preventative maintenance or undertaking a complete cooling system overhaul, OE Match components provide the quality expected by Porsche enthusiasts and specialist workshops.
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- 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 Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
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- 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
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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>>
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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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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
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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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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.
OE Match heater coolant return hose is a direct-fit replacement designed to replicate the original Porsche hose used in the heater return circuit on Porsche 911 996 and 997 models. It carries coolant from the heater core back into the engine cooling system, supporting both cabin heating and overall thermal regulation.
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
The hose installs directly using original mounting points and standard Porsche hose clamps, making it suitable for both routine maintenance and larger cooling system overhauls.
The heater coolant return hose channels warmed coolant from the heater core back to the engine’s cooling circuit, completing the heater loop. This allows the cooling system to maintain balanced flow and ensures consistent interior heating performance.
Installed between the heater core outlet and the engine return line, this hose:
• Maintains correct coolant flow and pressure in the heater circuit
• Supports reliable cabin heating
• Resists collapse, swelling, and heat degradation
• Integrates with factory hose routing and connections
Its OE-matched geometry ensures proper clearance and reduces stress on joints and adjacent hoses.
Over time, heater hoses deteriorate due to heat cycling and coolant exposure. A failing return hose can cause coolant leaks, reduced heating efficiency, air ingress into the cooling system, or engine overheating. Replacing worn hoses with an OE Match component restores proper coolant circulation and helps prevent unexpected cooling system 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
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OE Match heater coolant return hose is a direct-fit replacement designed to replicate the original Porsche hose used in the heater return circuit on Porsche 911 996 and 997 models. It carries coolant from the heater core back into the engine cooling system, supporting both cabin heating and overall thermal regulation.
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
The hose installs directly using original mounting points and standard Porsche hose clamps, making it suitable for both routine maintenance and larger cooling system overhauls.
The heater coolant return hose channels warmed coolant from the heater core back to the engine’s cooling circuit, completing the heater loop. This allows the cooling system to maintain balanced flow and ensures consistent interior heating performance.
Installed between the heater core outlet and the engine return line, this hose:
• Maintains correct coolant flow and pressure in the heater circuit
• Supports reliable cabin heating
• Resists collapse, swelling, and heat degradation
• Integrates with factory hose routing and connections
Its OE-matched geometry ensures proper clearance and reduces stress on joints and adjacent hoses.
Over time, heater hoses deteriorate due to heat cycling and coolant exposure. A failing return hose can cause coolant leaks, reduced heating efficiency, air ingress into the cooling system, or engine overheating. Replacing worn hoses with an OE Match component restores proper coolant circulation and helps prevent unexpected cooling system 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
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- 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
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- 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
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- 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
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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:
What This Product Does:
Why Replacement Matters:
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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.
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- Porsche 997 MKII Turbo 2010-13
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- 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
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- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
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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
Price: €42.60
In stock