Engine Block Hoses

Engine coolant vent line
OE Match engine coolant vent line for Porsche 958 Cayenne, 95B.1 Macan, and 970.2 Panamera models. This replacement cooling system vent line helps route coolant and air bleed flow correctly, supporting reliable cooling system operation and proper system bleeding.

Fits:
Porsche 958 Cayenne 3.6L 2011 - 2018
Porsche 95B.1 Macan 3.0L / 3.6L  2014 - 2018
Porsche 970.2 Panamera 3.0L 2013 - 2016

Diagram ref no 12

The coolant vent line helps move trapped air and coolant through the cooling system venting circuit. Correct vent line operation supports cooling system bleeding, helps prevent air pockets, and assists stable coolant circulation during engine operation.

Functions
• Replaces the engine coolant vent line
• Helps route coolant and air bleed flow correctly
• Supports cooling system bleeding and circulation
• Helps prevent trapped air within the coolant system
• Helps maintain stable engine operating temperature
• Suitable for coolant leak repair, engine service, or preventive maintenance
•  OE Match replacement for Porsche cooling system service

Why Replace This Part?
Coolant vent lines can harden, crack, swell, split, leak, or become blocked due to age, heat cycles, coolant exposure, pressure, and engine bay conditions. A damaged or restricted vent line may cause coolant loss, air pockets, overheating symptoms, coolant smell, pressure loss, or visible residue around the engine bay. Replacing the vent line helps restore correct cooling system integrity and reliable air bleeding.

When to Replace This Part
•   Coolant leak is visible from the vent line area
•   Hose or line is cracked, brittle, swollen, split, or soft
•   Cooling system pressure loss is present
•   Coolant smell or residue is noticed in the engine bay
•   Overheating or trapped air symptoms are present
•   Cooling system service or engine repair is being carried out
•   Preventive hose replacement is required during restoration or maintenance.

Where it fits on the car
This vent line fits within the engine cooling system / coolant vent circuit on applicable Porsche 958 Cayenne, 95B.1 Macan, and 970.2 Panamera models.

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Related, superseded, cross reference or alternative numbers for comparison.

94610602661

The product you are viewing cross references to these numbers

Engine Cooling Water Pipe.

Maintain reliable coolant circulation and effective engine temperature management with this Porsche Engine Cooling Water Pipe, part number 95812107500, designed for compatible Porsche applications.
Fits:

• Porsche 95B.1 Macan Petrol 2.0L (237Bhp) 2014-18

Diagram Ref No 8

The cooling water pipe forms part of the engine's pressurised cooling circuit, providing a route for coolant between the relevant engine and cooling-system components. Correct coolant circulation is essential for transferring heat away from the engine and maintaining a stable operating temperature.

Unlike flexible coolant hoses, rigid or formed coolant pipes provide a defined coolant path through areas where accurate routing, secure connections and resistance to heat and pressure are particularly important.

Over time, a cooling water pipe and its associated connections can deteriorate due to repeated thermal cycling, corrosion, vibration, damaged seals or previous repairs. Even a small leak can gradually reduce the coolant level, while a more significant failure can cause rapid coolant loss and engine overheating.

Replacing a leaking, corroded or damaged pipe with the correct Porsche Engine Cooling Water Pipe 95812107500 helps restore cooling-system integrity and dependable coolant circulation.
What This Product Does:

• Carries coolant through the engine cooling system.
• Connects relevant cooling-system components.
• Provides a defined route for coolant circulation.
• Contains hot, pressurised engine coolant.
• Helps maintain a sealed cooling circuit.
• Supports efficient heat transfer away from the engine.
• Helps maintain stable engine operating temperatures.
• Supports correct cooling-system performance.
• Helps prevent coolant loss when correctly sealed.
• Works alongside coolant hoses, the radiator, water pump and other cooling components.
• Replaces a leaking, corroded or damaged coolant pipe.
• Provides a Porsche replacement component for compatible applications.  

Symptoms Of Wear Or Failure:

• Visible coolant leakage.
• Coolant level repeatedly dropping.
• Low coolant warning.
• Engine temperature higher than normal.
• Engine overheating.
• Temperature fluctuations.
• Coolant smell from the engine compartment.
• Steam from the engine bay.
• Wetness around the coolant pipe.
• Leakage around pipe connections.
• Dried or crystallised coolant deposits.
• Visible corrosion on the pipe.
• Pitting or deterioration of the pipe surface.
• Damaged or distorted pipework.
• Leakage around seals or O-rings.
• Coolant collecting underneath the vehicle.
• Increasing need to top up the coolant.  

Why Replacement Matters:

• The engine cooling system relies on maintaining the correct quantity of coolant within a sealed circuit.
• If the cooling water pipe develops a leak, the coolant level can gradually fall. A severely deteriorated pipe or failed connection can also result in sudden coolant loss.
• Replacing a confirmed faulty Porsche Cooling Water Pipe 95812107500 helps restore the integrity of the cooling circuit and reduces the risk of overheating caused by coolant loss.

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

95812107500

The product you are viewing cross references to these numbers

Engine Cooling Water Pipe.

Maintain reliable coolant circulation and effective engine temperature management with this OE Match Engine Cooling Water Pipe, designed for compatible Porsche applications.

Fits:

• Porsche 95B.1 Macan Petrol 2.0L (237Bhp) 2014-18

Diagram Ref No 8

The cooling water pipe forms part of the engine's pressurised cooling system, providing a secure route for coolant between the relevant engine and cooling-system components. Coolant absorbs heat generated by the engine and carries it through the cooling circuit, helping maintain the correct operating temperature.

Because cooling-system components are continually exposed to heat, pressure, vibration and repeated thermal cycling, coolant pipes and their connections can deteriorate with age. Corrosion, damaged sealing surfaces, failed O-rings or physical damage can eventually result in coolant leakage.

Even a relatively small leak can gradually lower the coolant level. More severe pipe or connection failure can result in rapid coolant loss and engine overheating.

This OE Match Engine Cooling Water Pipe provides a high-quality replacement for a leaking, corroded or damaged original component, helping restore cooling-system integrity and dependable coolant circulation.

What This Product Does:

• Carries coolant through the engine cooling system.
• Connects relevant cooling-system components.
• Provides a defined route for coolant circulation.
• Contains hot, pressurised engine coolant.
• Helps maintain a sealed cooling circuit.
• Supports efficient heat transfer away from the engine.
• Helps maintain stable engine operating temperatures.
• Supports correct cooling-system performance.
• Helps prevent coolant loss when correctly sealed.
• Works alongside coolant hoses, the radiator, water pump and other cooling components.
• Replaces a leaking, corroded or damaged coolant pipe.
• Provides a Porsche replacement component for compatible applications.  

Symptoms Of Wear Or Failure:

• Visible coolant leakage.
• Coolant level repeatedly dropping.
• Low coolant warning.
• Engine temperature higher than normal.
• Engine overheating.
• Temperature fluctuations.
• Coolant smell from the engine compartment.
• Steam from the engine bay.
• Wetness around the coolant pipe.
• Leakage around pipe connections.
• Dried or crystallised coolant deposits.
• Visible corrosion on the pipe.
• Pitting or deterioration of the pipe surface.
• Damaged or distorted pipework.
• Leakage around seals or O-rings.
• Coolant collecting underneath the vehicle.
• Increasing need to top up the coolant.  

Why Replacement Matters:

• The cooling system must remain sealed and contain the correct amount of coolant to regulate engine temperature effectively.
• A damaged cooling water pipe can compromise this sealed circuit.
• A small leak may initially seem minor, but continued coolant loss can eventually reduce the system level enough to affect cooling performance. A weakened pipe or connection may also deteriorate further and fail suddenly.
• Replacing a confirmed faulty OE Match Cooling Water Pipe helps restore the integrity of the coolant circuit and reduces the risk of overheating caused by coolant loss.

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

95812107500

The product you are viewing cross references to these numbers

Hose connector y-piece.

Fits:
Porsche 970 Panamera 3.0L 2014-2016 
Porsche 95B Macan V6 Petrol 2014-2018
Porsche 95B.2 Macan 2019*

Related reference numbers
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7PP121237

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

99970758640

The product you are viewing cross references to these numbers

O-Ring – 11 x 2.5mm Water Coolant Breather Line
Sold each

Ensure a reliable, leak-free cooling system with this OE Match O-Ring, measuring 11 x 2.5mm. Designed as a direct replacement for the original seal used on the water coolant breather line.

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.

Manufactured from high-quality, coolant-resistant elastomer, this OE Match O-ring is designed to match the dimensions and performance of the original Porsche component for dependable long-term sealing.

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

99970758640

The product you are viewing cross references to these numbers

Water coolant hose - Tiptronic

Fits:
Porsche 958 Cayenne V6 - 2010 to 2017 (Tiptronic)

Click 'Zoom in' for large parts diagram.
Diagram ref no 28

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95810605600

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Water coolant hose.

Fits:
Porsche 95B.1 Macan 2.0L 2014-18
for cars without auxiliary heater / parking heater (option code: 9M0)

Click 'Zoom in' for large parts diagram.
Diagram ref no 22

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95B121056

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Water Coolant Hose.
The OE Match Water Coolant Hose is a high-quality replacement cooling system component designed to transport engine coolant between key cooling system components while maintaining a sealed, pressurised circuit. Manufactured to OE specifications for fit, flexibility and durability, this coolant hose ensures efficient coolant circulation to help maintain the correct engine operating temperature under all driving conditions.  

Fits:

Diagram Ref No 22

Constructed from premium-quality reinforced rubber with heat- and pressure-resistant materials, the hose is engineered to withstand continuous exposure to hot coolant, engine vibration and fluctuating operating pressures. Precision-moulded to match the original routing and connection points, it provides secure installation and reliable leak-free performance.  

What This Product Does:

• Transfers coolant between engine cooling system components.
• Maintains efficient coolant circulation throughout the cooling system.
• Helps regulate engine operating temperature.
• Supports effective heat transfer through the radiator.
• Provides secure, leak-free coolant flow under pressure.
• Works with the water pump, thermostat and radiator to optimise cooling.
• Protects the engine from overheating.
• Contributes to long-term engine reliability and performance.

Symptoms Of Wear Or Failure:

• Coolant leaks around the hose or hose connections.
• Low coolant level warnings.Engine overheating.
• Cracks, splits or perishing of the hose material.
• Swollen, soft or excessively hardened hose sections.
• Coolant odour from the engine bay.
• White or coloured coolant residue around the hose.
• Bulging or collapsed hose under pressure.
• Steam escaping from the engine compartment.
• Reduced heater performance due to coolant loss or restricted flow.

Why Replacement Matters:

• Coolant hoses operate under constant pressure and are continually exposed to high temperatures, engine vibration, coolant chemicals and environmental ageing. Over time, the rubber material can harden, crack, swell or lose its structural integrity, increasing the risk of coolant leaks or sudden hose failure.
• A failed coolant hose can rapidly reduce coolant levels and compromise the engine's ability to regulate temperature. Continued driving with insufficient coolant circulation may result in severe engine overheating, potentially causing warped cylinder heads, head gasket failure and costly internal engine damage.
• Replacing a worn or damaged coolant hose restores reliable coolant circulation and maintains the integrity of the engine cooling system. An OE Match replacement provides factory-style fitment, dependable sealing performance and long-lasting durability, helping preserve the performance, efficiency and reliability expected from your Porsche.

Related reference numbers
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95B121056

The product you are viewing cross references to these numbers

Water coolant pipe with coolant hose. 

Fits:
Porsche 95B Macan  S 3.0ltr - 2014 to 2018
Porsche 95B Macan GTS 3.0ltr - 2014 to 2018
Porsche 95B Macan turbo 3.6ltr - 2014 to 2018

Click 'Zoom in' for large parts diagram.
Diagram ref no 9


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94610605134

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Water coolant pipe with t-piece connector.

Fits:
Porsche 95B.1 Macan 2.0L 2014-18

Click 'Zoom in' for large parts diagram.
Diagram ref no 12

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95B121049E

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Water coolant pipe with t-piece connector.  Engine Coolant Hose

Radiator hoses have an important job to transport your engines coolant to and from its cooling system components. Over time they can become dry, hard, brittle, or leak which warrants a replacement. When replacing we also recommend a coolant flush and replacement to remove any possible sludge formed over time.

Engine Coolant Hose Failure Symptoms

Cracking - Leaking - Swelling - Deterioration  

Fits:
Porsche 95B.1 Macan 2.0ltr -  2014 to 2018

Diagram ref no 12

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95B121049E

The product you are viewing cross references to these numbers

Water hose.

Fits:
Porsche 958 Cayenne 3.0L Diesel 2012-18
Porsche 95B Macan 3.0L Diesel 2014-18
Porsche 970 Panamera 3.0L Diesel 2012-16

Click 'Zoom in' for large parts diagram.
Diagram ref no 20

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95810645500

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