Water Hose. Porsche 996 / 997 Carrera / Turbo / GT2 2000-09  ›  99630771113

Water Hose.

The Genuine Porsche Water Hose is a replacement coolant hose used within the Tiptronic automatic-transmission ATF cooler circuit on selected Porsche 911 models.

Fits:

• Porsche 996 C2 3.6L 2002-2005
• Porsche 996 C4 3.6L 2002-2005
• Porsche 996 C4S 3.6L 2002-2005
• Porsche 996 TURBO 2000-05
• Porsche 996 GT2 2001-05
• Porsche 997 MK1 Carrera 2 3.6L 2005-08
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08
• Porsche 997 MK1 Carrera 4 3.6L 2005-08
• Porsche 997 MK1 Carrera 4S 3.8L 2005-08
• Porsche 997 MK1 TURBO 2007-09
• Porsche 997 MK1 GT2 2007-09  

Diagram Ref No 16

Although positioned within the transmission oil cooler system, this hose carries engine coolant rather than automatic transmission fluid. Coolant circulates through the ATF heat exchanger, allowing heat to be transferred between the transmission fluid and the engine cooling system.

Maintaining this coolant flow helps the Tiptronic transmission reach and remain within an appropriate operating temperature range during normal driving, motorway use and higher-load conditions.

As the hose ages, repeated heat cycles, cooling-system pressure and exposure to coolant can cause the rubber to harden, swell, crack or leak. Replacing a deteriorated hose helps restore a sealed cooling circuit and reliable coolant flow through the ATF heat exchanger.

What This Product Does:
The water hose forms part of the coolant circuit serving the Tiptronic transmission heat exchanger.

It is designed to:

• Carry engine coolant through the ATF cooler circuit.
• Support transmission-fluid temperature regulation.
• Maintain coolant circulation through the heat exchanger.
• Help remove excess heat from the automatic transmission fluid.
• Help the transmission reach an appropriate operating temperature.
• Maintain cooling-system pressure.
• Prevent coolant loss when correctly sealed.
• Replace a cracked, hardened or leaking original hose.
• Support reliable Tiptronic transmission cooling.

Symptoms Of Wear Or Failure:
Possible symptoms include:

• Visible coolant leakage.
• Coolant dripping beneath the vehicle.
• Dampness around the hose or connections.
• Dried coolant residue around hose ends.
• Gradual loss of coolant.
• Coolant-level warning.
• Sweet coolant smell after driving.
• Hose becoming hard or brittle.
• Surface cracking.
• Swelling or bulging.
• Soft or spongy areas.
• Leakage when the engine reaches operating temperature.
• Cooling-system pressure loss.
• Engine temperature becoming unstable.
• ATF temperature increasing under heavy use if coolant circulation is compromised.

Why Replacement Matters:
Replacement may be appropriate when:

• Coolant leakage is confirmed.
• Dried coolant residue is visible.
• The hose is cracked.
• Rubber has become hard.
• The hose is swollen.
• Soft spots are present.
• Hose ends no longer seal correctly.
• The hose has been damaged during transmission or cooling-system work.
• The ATF cooler is being replaced or serviced.
• The cooling system is undergoing preventative refurbishment.
• The original hose is old and its condition is uncertain.

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

99630771113

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