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

Coolant supply water hose.
This Porsche Genuine OE Coolant Supply Water Hose is an original-equipment cooling system hose designed specifically for the Porsche 911 (996) Carrera 4 with the 3.4 L engine. Manufactured to Porsche’s factory specifications, this hose provides the exact fit, material quality, and durability required to maintain reliable coolant circulation within the engine cooling system.

Fits:
Porsche 996 C4 3.4L 1998 - 2001

Diagram ref no 1

This genuine Porsche hose replaces earlier part numbers 99610674003 and 99610674004, ensuring compatibility with the original cooling system design used in early 996 Carrera 4 models.

The coolant supply water hose carries engine coolant between key cooling system components, helping transport hot coolant from the engine to the radiator or distribution pipes where heat is dissipated. By maintaining steady coolant flow, it helps regulate engine temperature and prevents overheating.

A correctly functioning coolant hose ensures the cooling system maintains proper pressure and flow, allowing the engine to operate within its designed temperature range even under high load or spirited driving conditions.

Functions & Technical Role
•  Coolant transfer: Moves coolant between the engine and the main cooling supply pipes
•  Temperature regulation: Supports the cooling system in maintaining optimal engine operating temperature
•  Pressure resistance: Designed to withstand high coolant pressure and temperature cycles
•  Durable construction: Manufactured from heat- and ozone-resistant rubber compounds for long service life
•  OEM precision fit: Exact hose shape and connections to match Porsche’s original cooling layout

Fitment / Position on Car
•  Installed on: Engine cooling system
•  Location: Between the rear coolant supply pipe and the main distribution pipe / radiator supply line
•  Function: Forms part of the primary coolant circulation circuit between engine and cooling components.

Coolant hoses are exposed to constant heat, pressure, and vibration. Over time they can harden, crack, or leak, which may lead to coolant loss and potential engine overheating. Replacing worn hoses with genuine Porsche OE parts ensures the correct material quality, fitment, and durability required to maintain the performance and reliability of the Porsche cooling system.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

99610674006

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