Water hose. Engine Supply Pipe to Main Supply Pipe. Porsche 996 C2 › 99610664056

This OE Match water hose connects the engine supply pipe to the main supply pipe on the specified rear-wheel-drive Porsche 996 C2 models. It forms part of the coolant supply circuit and provides a replacement connection when the existing hose is damaged or leaking.

Fits

• Porsche 996 C2 3.4L 1997–08/01
• Porsche 996 C2 3.6L 09/01–2005

338 - Rear-Wheel Drive Application restriction: 

Diagram Ref No 1

Check fitment for your specific vehicle (model, year, engine) before ordering.

What Is This Part?
This is a connecting hose in the engine cooling system, joining the engine supply pipe and the main supply pipe. It forms the flexible section between those pipe connections, carrying coolant through that part of the circuit. Its condition and the condition of the adjoining connections both matter when investigating coolant loss. During replacement, inspect the pipe ends and retaining clamps so that a damaged connection is not left unresolved.

What Does This Part Do?

• Connects the supply pipes: Joins the engine supply pipe to the main supply pipe.
• Carries coolant: Provides a passage through this section of the cooling circuit.
• Forms the hose-to-pipe joints: Works with the associated retaining clamps to contain coolant at the connections.

Why Replace This Part?
Coolant hoses can deteriorate through repeated exposure to heat, coolant and their surrounding environment. Cracks, local softening, swelling or damage near the hose ends are reasons to assess replacement rather than simply tightening the clamps. Internal deterioration may also be present before an obvious external split appears.

Replace this hose if inspection confirms leakage or damage to its body or ends. Inspect the adjoining pipes and clamps at the same time: a leak at a connection does not automatically mean that the hose alone is responsible. Cooling-system work is a useful opportunity to check its condition, but removal by itself does not establish that replacement is necessary. 

When to Replace This Part?

• Confirmed leakage: Fresh coolant appears from the hose body or a damaged hose end.
• Cracks at the connections: Splits are visible around the areas secured by the clamps.
• Soft spots or bulging: Local changes in shape or firmness suggest deterioration.
• Surface damage: Rubbing or cuts have damaged the hose wall.
• Poor seating: A distorted or damaged hose end no longer sits correctly on its pipe connection.

Soft spots, cracks around fittings and bulges are recognised coolant-hose inspection points. Check the hose only when the cooling system has cooled. 

Where Is This Part Fitted?
Location: Between the engine supply pipe and the main supply pipe in the coolant supply circuit. Match these connection points and the rear-wheel-drive application before fitting.

Product Summary

• Product: Engine supply pipe to main supply pipe water hose.
• Brand: OE Match.
• Part reference: 99610664056.
• Additional supplied references: 99610664053 and 99610664054.
• Application restriction: Rear-wheel-drive Porsche 996 C2, I338 / M338.
• Purpose: Connects the two supply pipes within the coolant circuit.