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Coolant Hoses - Engine Bay
By OE Match
- 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Related, superseded, cross reference or alternative numbers for comparison.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 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
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99610623356
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- 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Related, superseded, cross reference or alternative numbers for comparison.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Related, superseded, cross reference or alternative numbers for comparison.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Related, superseded, cross reference or alternative numbers for comparison.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 3.4L 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
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- 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
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99610674110
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- Porsche 996 C4 3.4L 1997-08/01
This OE Match coolant supply water hose is a direct-fit replacement hose designed for the Porsche 996 Carrera 4 (1998–2001) with the 3.4L engine. Manufactured to match the original Porsche part in shape, material and durability, this hose ensures reliable coolant flow within the engine’s cooling system.
Fits:
Porsche 996 C4 3.4L 1998 - 2001
Diagram ref no 1
This product supersedes Porsche's old part numbers: 99610674003, 99610674004
This coolant supply hose forms part of the engine cooling system in the Porsche 996. It connects key cooling system components and allows coolant to circulate between the engine and cooling circuit, helping maintain the correct operating temperature.
The OE Match hose replicates the original hose design with the correct bends, diameter and reinforced rubber construction to ensure proper fitment and long-term reliability.
The hose carries coolant through the engine cooling circuit, allowing the radiator and thermostat system to regulate engine temperature. Proper coolant circulation prevents overheating and ensures the engine operates within its designed temperature range.
Replacing old or deteriorated hoses helps maintain efficient cooling system performance and prevents coolant leaks that could lead to engine damage.
Function
• Coolant Circulation: Transfers coolant through the engine cooling system
• Temperature Regulation: Supports stable engine operating temperature
• Leak Prevention: Reinforced rubber construction ensures secure coolant flow
Coolant hoses are exposed to heat, pressure and coolant chemicals over time, which can cause the rubber to harden, crack or weaken. A failing hose may lead to coolant leaks or sudden rupture, potentially resulting in engine overheating. Replacing ageing hoses ensures reliable coolant circulation and protects the engine from temperature-related damage.
Consider replacing the coolant hose if you notice:
• Coolant leaks around hose connections
• Cracked or brittle rubber hose material
• Swelling or soft spots in the hose
• During cooling system servicing or preventative maintenance
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610674006
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
- Porsche 996 TURBO 2000-05

Fits:
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Click 'Zoom in' for large parts diagram.
Diagram ref no 5
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99610672305
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
This OE Match water hose is a coolant hose designed to connect the engine cooling circuit to the water thermostat housing on Porsche 911 (996) models produced between 1998 and 2005. This hose forms part of the engine’s cooling system, allowing coolant to circulate between the engine and thermostat assembly to regulate operating temperature.
Fits:
Porsche 996 C2 / C4 / C4S 1998 - 2005
Diagram ref no 24
This product supersedes Porsche's old part numbers: 99610650253, 99610650254.
The hose carries coolant between the thermostat housing and the engine’s cooling pipes. This allows the thermostat to regulate coolant flow depending on engine temperature, ensuring the engine warms up efficiently and remains within the correct operating range.
A properly functioning coolant hose is essential to maintain stable engine temperatures and prevent overheating.
Function
• Coolant Circulation: Transfers coolant between the thermostat housing and engine cooling pipes
• Temperature Regulation: Supports thermostat operation in controlling engine temperature
• Cooling System Integrity: Maintains sealed coolant flow under pressure
• Engine Protection: Helps prevent overheating and cooling system leaks
Coolant hoses operate under constant heat and pressure. Over time the rubber can become brittle, swell or crack due to thermal cycling and coolant exposure. A deteriorated hose may cause coolant leaks or reduced cooling efficiency, potentially leading to engine overheating. Replacing worn hoses ensures the cooling system maintains proper pressure and flow.
When to Replace. Consider replacing the hose if you notice:
• Visible cracks, swelling or deterioration in the rubber
• Coolant leaks around the thermostat connection
• Loss of coolant pressure or overheating issues
• During cooling system overhaul or thermostat replacement.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610650256
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
3-way to water pipe; original style with bleed nipple and straight flared hose end.
Fits:
Porsche 996 C2 / C4 1998-01 3.4L
This product supersedes Porsche's old part numbers:
- 99610625053
- 99610625054
- 99610625055
- 99610685000
Diagram ref no 18.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610685005
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
High-quality OE Match coolant hose engineered to match the original Porsche specification for fit, flexibility, and durability. It is designed for the Porsche 996 (911) 1998–2005 with Tiptronic automatic transmission, and carries coolant within the engine’s cooling circuit to maintain proper operating temperatures. It installs directly in place of the original hose with no modification required, ensuring correct coolant flow and long-term service life.
Fits:
Porsche 996 C2 / C4 / C4S 1998 - 2005 Tiptronic Gearbox
Diagram ref no 33.
The Porsche 996’s water cooling system is responsible for regulating engine temperature under all driving conditions - from cold starts to high-speed touring. The water hose is a critical link in the coolant circuit, connecting key components such as the water pump, thermostat housing, radiator, and cylinder head.
Over time, heat cycling, pressure fluctuations, and environmental exposure cause hoses to age. Rubber can harden, swell, crack, or develop soft spots that lead to leaks, reduced coolant flow, or sudden failure. Because this hose operates under both thermal and pressure stress, deterioration can compromise cooling performance and increase the risk of engine overheating.
The water hose:
• Carries pressurised engine coolant between major cooling system components
• Maintains consistent coolant flow for stable temperature control
• Withstands heat, vibration, and pressure from the engine’s cooling system
• Helps prevent overheating and protects engine components
A compromised water hose can lead to:
• Coolant leaks
• Reduced heating efficiency
• Engine overheating
• Loss of pressure in the cooling circuit
Replacing old or degraded hoses with an OE Match water hose helps maintain coolant flow, preserves optimal engine temperatures, and prevents unexpected breakdowns due to hose failure.
Replace this water hose if you notice:
• Visible cracks, soft spots, or swelling
• Coolant leakage at hose ends
• Unexplained engine overheating
• During water pump or thermostat service
• As part of preventative maintenance on higher-mile vehicles
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610622266
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
It provides reliable coolant flow between the engine and the heating/cooling system, maintaining optimal operating temperature and engine performance. Manufactured to match the original equipment’s material specification, bend geometry, this hose delivers a direct fit and factory-style durability.
Fits:
Porsche 996 C2 / C4 3.4L Manual Gearbox
Up to model year 2001
Diagram ref no 33
• Position on Vehicle: Located within the engine cooling circuit, this hose connects key engine cooling components and is mounted in the front engine bay.
• Cross-Reference / Alternative Numbers: Part number 996 106 222 65 (99610622265) — includes superseded numbers such as 99610622252, 99610622254, 99610622256.
• Applications: Ideal for when the original hose has become brittle, swollen, leaking or is due for renewal during engine service or cooling system overhaul.
The coolant hose is vital in maintaining proper engine temperature, protecting against overheating and ensuring the cooling system works as designed. A worn or damaged hose can lead to coolant leaks, engine overheating, poor heater performance or even severe engine damage. Replacing restores secure coolant flow, prevents failure and ensures your Porsche runs reliably.
When and why to replace:
• Visible cracks, bulging or brittleness in the original hose.
• Coolant leakage or low coolant level with no obvious external damage.
• Heating or cooling performance has reduced (e.g., slow warm-up or overheating).
• During scheduled cooling system service or when replacing other cooling system components.
• High-mileage vehicles where original hoses are showing signs of age and fatigue.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610622265
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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