Water Pipe, Supply Tunnel. Porsche 987 Boxster / 987C Cayman 2.7L / 2.9L 2005-12  ❭  98710665104

The Porsche Water Pipe, Supply Tunnel 98710665104 is a genuine Porsche replacement coolant supply pipe for selected 987 Boxster and Cayman models.

Fits:

• Porsche Boxster 987 2.7L 2005-08/08
• Porsche Boxster 987 MKII 2.9L 2009-12
• Porsche Cayman 2.7L 987C 2006-08
• Porsche Cayman 2.9L 987C MKII 2009-12  

The Porsche 987 cooling system relies on long supply and return pipes to transport coolant between the engine and radiators. A secure, unrestricted supply pipe is therefore essential for maintaining coolant circulation, system pressure and stable engine temperature.

As a Genuine Porsche component, 98710665104 provides the factory-specified routing, dimensions and connection points for the applicable vehicle.

What This Product Does:
The centre-tunnel supply pipe carries coolant through the vehicle as part of the pressurised engine cooling system.

Its main functions include:

• Carrying coolant through the centre tunnel
• Connecting the rear engine cooling circuit with the front radiator circuit
• Maintaining continuous coolant circulation
• Helping maintain correct cooling-system pressure
• Supporting stable engine operating temperature
• Helping transfer heat away from the engine
• Maintaining the original Porsche coolant routing
• Providing a leak-free connection when correctly installed and sealed

The supply pipe works together with the corresponding return tunnel pipe to create the main coolant path between the engine and front radiators.

Symptoms Of Wear Or Failure:
Coolant pipes can deteriorate through age, corrosion, vibration, road contamination and repeated heat cycles.

Common symptoms include:

• Visible coolant leakage beneath the vehicle
• Coolant dripping from the centre tunnel area
• Pink, white or crusty coolant deposits
• Falling coolant level
• Frequent need to top up the expansion tank
• Low coolant warning
• Sweet coolant smell
• Corrosion or pitting on the pipe
• Damaged or distorted pipe sections
• Leakage around pipe connections or seals
• Cooling-system pressure loss
• Fluctuating engine temperature
• Higher-than-normal coolant temperature
• Steam or coolant vapour
• Engine overheating

Small leaks may only appear when the engine is fully warm and the cooling system has reached operating pressure.

Why Replacement Matters:
A leaking coolant supply pipe can reduce both coolant quantity and system pressure.

As coolant is lost, air may enter the system and circulation can become less effective.

Continued operation with a damaged pipe can contribute to:

• Loss of coolant
• Reduced cooling efficiency
• Cooling-system pressure loss
• Air pockets within the system
• Localised hot spots
• Engine overheating
• Reduced heater performance
• Coolant warning messages
• Roadside breakdown
• Serious engine damage if overheating becomes severe

Replacing a deteriorated tunnel pipe restores the integrity of the coolant circuit and helps maintain reliable temperature control.