Coolant supply water hose. Porsche 996 C4 3.4L 1998-01  ❭  99610674006

Coolant supply water hose.
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Related, superseded, cross reference or alternative numbers for comparison.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

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