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Porsche // 964 (911) (1989-1994) // 964 (911) RS 3.8L 1991-93
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O-Ring – 11 x 2.5mm Water Coolant Breather
Line
Sold each
Maintain the integrity of your Porsche's cooling system with this Coolant Breather Line O-Ring.. Measuring 11 x 2.5mm, this factory-original sealing ring is designed to provide a reliable, leak-free seal between the coolant breather line and its associated components.
Fits:
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
- Porsche 970.1 Panamera Turbo S V8 4.8L 2009-13
- Porsche 970.1 Panamera Diesel V6 3.0L 2011-13
- Porsche 970.1 Panamera S Hybrid V6 3.0L 2011-13
- Porsche 970.2 Panamera V6 3.6L 2WD (310Hp) 2014-16
- Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD (420Hp) 2014-16
- Porsche 970.2 Panamera S V6 Turbo 3.0L 2WD Executive 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD (420Hp) 2014-16
- Porsche 970.2 Panamera 4S V6 Turbo 3.0L 4WD Executive 2014-16
- Porsche 970.2 Panamera GTS V8 4.8L 4WD (440Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 4.8L (520Hp) 2014-16
- Porsche 970.2 Panamera Turbo V8 Executive 2014-16
- Porsche 970.2 Panamera Turbo S V8 4.8L 2014-16
- Porsche 95B.1 Macan GTS Petrol 3.0L V6 (360Bhp) 2014-18
- Porsche 95B.1 Macan Turbo 3.6L V6 (400Bhp) 2014-18
Diagram ref no 12
Although small, this sealing ring plays a vital role in maintaining the integrity of the cooling system. It creates a watertight seal between the breather line and its mating components, preventing coolant leaks while allowing the cooling system to maintain the correct operating pressure. Replacing ageing or damaged O-rings during cooling system maintenance helps prevent coolant loss, overheating and expensive engine repairs.
What Does the Water Coolant Breather Line O-Ring Do?
The coolant breather line O-ring seals the connection between coolant pipes and breather line fittings within the engine's cooling system.
Its functions include:
- Preventing coolant leaks.
- Maintaining cooling system pressure.
- Ensuring efficient coolant circulation.
- Preventing air from entering the cooling system.
- Supporting correct engine operating temperatures.
- Helping maximise cooling system efficiency.
A correctly sealing O-ring is essential for maintaining the performance and reliability of the engine cooling system.
Why Does the O-Ring Need Replacing?
Over time, coolant seals are subjected to constant temperature fluctuations and coolant exposure, causing them to deteriorate.
Common causes of failure include:
- Heat cycling.
- Age-related hardening.
- Loss of elasticity.
- Coolant chemical degradation.
- Damage during removal.
- Compression set after years of service.
- Cooling system repairs requiring seal replacement.
As with most sealing components, O-rings should always be replaced once removed.
Symptoms of a Failing Coolant Breather Line O-Ring
Signs of a worn or damaged seal include:
- Coolant leaks around the breather line.
- Pink, white or dried coolant residue.
- Low coolant warning messages.
- Frequent coolant top-ups.
- Sweet coolant smell from the engine bay.
- Reduced cooling system pressure.
- Small coolant drips after driving.
Replacing the O-ring at the first sign of leakage helps prevent overheating and further cooling system damage.
When Should the O-Ring Be Replaced?
Replacement is recommended whenever:
- The coolant breather pipe is removed.
- Cooling system components are replaced.
- A coolant leak is diagnosed.
- Carrying out thermostat or water pump repairs.
- Performing preventative cooling system maintenance.
- Rebuilding or servicing the engine.
Installing a new O-ring during reassembly ensures a reliable seal and reduces the risk of future coolant leaks.
Related reference numbers
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99970758640
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