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Porsche Engine Cooling Coolant Hoses and Pipes (Rear engine cars) Coolant Hoses - Engine Bay

Coolant return hose. Porsche 997.1 Carrera 2005-08  ›  99710683204

Coolant return hose. Porsche 997.1 Carrera 2005-08 - 99710683204, 99710683203 - 108791
3
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99710683204/1
Product Information
Product Information

Coolant Return Hose
OE Match coolant return hose for Porsche 997.1 Carrera 2, 2S, 4 and 4S models from 2005–2008. This replacement serves the return circuit beside the thermostat housing.


Fits
Porsche 997.1 C2 / C2S 2005 - 2008
Porsche 997.1 C4 / C4S 2005 - 2008

Diagram ref no 15

What This Product Does

The hose carries returning coolant within the engine's cooling circuit. Its location is in the water-pump and thermostat-housing assembly, where sound hose connections help contain coolant and maintain circulation.


Functions

  • Carries coolant along the return route.
  • Forms a connection within the thermostat-housing assembly.
  • Replaces a deteriorated return hose when leakage or damage is confirmed.


Technical Details

  • Brand: OE Match
  • Replacement reference: 99710683204.
  • Component identification: water hose return line.


Symptoms of Fault

  • Wetness beside the thermostat housing or hose ends.
  • Crusty deposits left by escaping coolant.
  • Repeated coolant-level warnings.
  • A sweet odour from the engine compartment.
  • Abnormally high temperature readings.
  • Bulging, splits, hardened areas or unusually soft sections.
  • Loss of cooling-circuit pressure.
  • Fresh seepage after switching off the engine.


Why Replacement Matters

Repeated heating and cooling, vibration and fluid exposure can gradually weaken a hose. Renewing a confirmed faulty return line addresses that leak source rather than relying on repeated topping-up. OE Match provides a Porsche-focused replacement option; match the reference and application before installation.

Inspect this hose when servicing the water pump, thermostat or adjoining pipework. Replacement may be appropriate if it is brittle, oil-contaminated or damaged during dismantling. Check clamps, connecting fittings and nearby hoses too, as deterioration elsewhere can leave an unresolved leak. Correct routing and clamp placement matter when refitting.




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Related, superseded, cross reference or alternative numbers for comparison.

99710683204
99710683204
99710683203

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