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Coolant Hoses - Engine Bay
By OE Match
- 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
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Related, superseded, cross reference or alternative numbers for comparison.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
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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

Fits:
Porsche 996 Turbo / GT2 2001-05
Porsche 996 GT3 1999-05
Click 'Zoom in' for large parts diagram.
Diagram ref no 19, 20, 21, 22
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610652973
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 996 C2 3.4L 1997-08/01
Fits:
Porsche 996 C2 3.4L Manual
Kits comes with engine bay rubber pipe
Diagram ref: #1, #3, #18, #23, # 24, #27, #33
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
WATERPIPEKIT996C2.34.M
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 996 C2 3.6L 09/01-2005
Fits:
Porsche 996 C2 3.6L Manual
Kits comes with engine bay rubber pipe
Diagram ref: #1, #3, #18, #23, # 24, #27, #33
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
WATERPIPEKIT996C2.36.M
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 996 C4 3.4L 1997-08/01
Fits:
Porsche 996 C4 3.4L Manual
Kits comes with engine bay rubber pipe
Diagram ref: #1, #3, #18, #23, # 24, #27, #33
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
WATERPIPEKIT996C4.34.M
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Fits:
Porsche 996 C4 3.6L Manual
Kits comes with engine bay rubber pipe
Diagram ref: #1, #3, #18, #23, # 24, #27, #33
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
WATERPIPEKIT996C4.36.M
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 RS 2003-04
Fits:
Porsche 996 Turbo 2001-05
Porsche 996 GT2 2002-05
Porsche 996 GT3 2004-05
Click 'Zoom in' for large parts diagram.
Diagram ref no 19
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610647775
The product you are viewing cross references to these numbers
- 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

Fits:
Porsche 996 Turbo / GT2 2001-05
Porsche 996 GT3 1999-05
Click 'Zoom in' for large parts diagram.
Diagram ref no 21
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610652973
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005

Fits:
Porsche 996 3.4L/3.6L C2 / C4 / C4S 1998-2005
M 66X 01815 >>
Click 'Zoom in' for large parts diagram.
Diagram ref no 29
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610623356
The product you are viewing cross references to these numbers
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Left Side Return Hose, From right side radiator return pipe to under car return pipe.

Fits:
Porsche 996 C4 / C4S 1998-05
All-wheel drive (option code: 339)
Click 'Zoom in' for large parts diagram.
Diagram ref no 11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610672806
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
From feed pipe.

Fits:
Porsche 996 C2 / C4 / C4S 1998-05
Click 'Zoom in' for large parts diagram.
Diagram ref no 27
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610621260
The product you are viewing cross references to these numbers
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Hose for long supply tube from engine to short tube going to radiator breather.

Fits:
Porsche 996 C4 / C4S 1998-05
All-wheel drive (option code: 339)
This product supersedes Porsche's old part numbers:
- 99610672403
- 99610672405
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610672406
The product you are viewing cross references to these numbers
- 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
This coolant hose is engineered to replicate the original Porsche part’s fit, material and function for the cooling system of Porsche 911 (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
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
Radiator coolant hoses are vital conduits within the engine cooling circuit. They transport engine coolant between the engine and radiator, allowing heat absorbed in the engine block to be released via the radiator.
Fits:
Porsche 996 C2 / C4 3.4L 1997 - 2005
Diagram ref no 23
Radiator coolant hose – connects radiator and engine coolant passages as part of the primary cooling loop.
Function:
• Circulates coolant between the engine and radiator
• Helps maintain optimal operating temperatures
• Prevents coolant leaks and pressure loss
• Contributes to engine reliability and longevity
Radiator hoses are continuously exposed to elevated temperatures, pressure fluctuations, and corrosive coolant chemicals. Over time, hoses can weaken, crack, swell, or become brittle, leading to:
• Fluid leaks Engine overheating
• Loss of coolant pressure
• Potential engine damage.
Replacing aged or damaged hoses ensures the cooling system maintains integrity, prevents leaks, and continues to operate as intended by the manufacturer.
Replace this radiator coolant hose if:
• Visible cracking, bulging, or soft spots
• Evidence of coolant seepage or wet residue
• Hoses feel mushy or stiff when squeezed
• During routine coolant service or before long-term storage
• If coolant system overhaul is being performed
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610650156
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.4L 1997-08/01
This OE Match coolant return water hose is a cooling system hose designed for Porsche 911 (996) Carrera 3.4L models with manual transmission produced between 1998 and 2001. This hose forms part of the engine’s coolant return circuit, transferring coolant from the engine return pipe to the main cooling system distribution pipe.
Fits:
Porsche 996 C2 3.4L 1998 - 2001 MANUAL
Diagram ref no 3
This product supersedes Porsche's old part numbers: 99610664156, 99610664158.
The coolant return hose allows coolant to flow back through the engine’s cooling circuit after absorbing heat from the engine. This circulation allows the cooling system to maintain stable engine operating temperatures and prevents overheating.
A properly functioning hose ensures uninterrupted coolant flow and supports efficient temperature control.
Function
• Coolant Return Flow: Transfers coolant from the engine return pipe to the cooling system distribution pipe
• Temperature Regulation: Supports the engine thermostat and radiator system
• Cooling System Integrity: Maintains sealed coolant circulation under pressure
• Engine Protection: Helps prevent overheating and coolant leaks
Coolant hoses are constantly exposed to heat, pressure and chemical contact from coolant. Over time the rubber can harden, crack or weaken, increasing the risk of coolant leaks. Replacing ageing hoses helps maintain cooling system reliability and protects the engine from overheating or coolant loss.
When to Replace. Consider replacing the hose when:
• Coolant leaks are visible around hose connections
• The hose shows cracks, swelling or deterioration
• During cooling system overhaul or thermostat service
• As preventative maintenance on higher-mileage engines
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610664162
The product you are viewing cross references to these numbers
- Porsche 996 C4 3.4L 1997-08/01

Fits:
Porsche 996 C4 3.4L 1998-01 MANUAL
This product supersedes Porsche's old part numbers:
- 99610674104
- 99610674106
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610674110
The product you are viewing cross references to these numbers
-
water cooling - 1 - for 996 CARRERA 2/4/4S M96.01/02/03/04 1998-05 105-05
-
water cooling - 2 - for 996 CARRERA M339 (all-wheel drive) M96.01/02/03/04 1998-05 105-12
-
connection piece 996 TURBO 2001-05 105-00
-
water pump, water pump housing 996 GT3-1 M96.76 2000-01 and 996 GT3-1/GT3 RS M96.79 2004-05 105-00
OEMatch Coolant Hoses - Engine Bay — Fit, Function, Confidence
Engine-bay coolant hoses route coolant between the radiator, water pump and engine to maintain operating temperature in Porsche models. OEMatch supplies a wide selection of hose types and the related clips and connectors commonly needed for routine maintenance and targeted repairs.
Available Types- Upper and lower radiator hoses for coolant flow between engine and radiator
- Water pump connection hoses that link pump outlets to the cooling circuit
- Heater and bypass hoses for cabin heat and system circulation
- Silicone and reinforced rubber options for higher temperature or performance applications
- Flexible couplers and joining pieces used at junctions and branch points
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original coolant hoses. OE (Original Equipment) refers to parts matching original specifications for the coolant hoses and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM coolant hoses engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models. In practical terms, engine-bay hoses are selected for internal diameter, length, bend profile and material to suit the coolant routing and connection points used on each Porsche model.
Benefits Include- Restored coolant circulation to maintain stable engine temperatures
- Reduced risk of leaks, overheating and related component damage
- Renewed hose ends and secure connections at clamps and fittings
- Heat ageing and repeated thermal cycling that harden or crack rubber
- Chemical attack from coolant breakdown or contamination
- Abrasion where hoses contact adjacent components or fastenings
- Loose or degraded clamps that allow leaks at joints
Timely replacement prevents coolant loss and the risk of engine overheating that can lead to more extensive repairs. Using correctly specified hoses and renewed clamps helps preserve the cooling circuit and supports reliable operation across driving conditions for Porsche models. Replace any hose showing swelling, cracking or soft spots and confirm connections while the system is cold.
Advantages- Direct-fit replacements engineered to match original dimensions and tolerances
- Options in reinforced rubber and silicone to suit temperature and service requirements
- Supplies commonly include compatible clips, seals and joining pieces for straightforward installation