Engine Block Hoses

Engine coolant vent line
This original Porsche coolant vent / breather line forms part of the engine cooling system, helping bleed air and route coolant vapour or coolant flow correctly through the cooling circuit.

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

What This Part Does / Functions
• Helps vent air from the engine cooling system
• Routes coolant or coolant vapour through the correct cooling circuit path
• Supports proper coolant circulation and system bleeding
• Helps reduce the risk of trapped air pockets in the cooling system
• Assists stable engine operating temperature
• Replaces a cracked, brittle, leaking or damaged original vent line
• Provides correct OE Porsche routing, shape and connection fitment
• Supports reliable cooling system performance.

Why Replace This Part?
Coolant vent lines are exposed to heat cycles, coolant pressure, vibration and age-related plastic or rubber deterioration. Over time, the line can become brittle, crack, split or leak. A failed coolant vent line may cause coolant loss, coolant smell, low coolant warnings, pressure loss or overheating. Replacing it with a Genuine Porsche OE engine coolant vent line helps restore correct cooling system venting and factory fitment. This is especially important on Porsche V6 applications where the coolant vent line routing is critical to proper system bleeding and coolant circulation.

Common Symptoms of a Faulty Coolant Vent Line
•  Coolant smell from the engine bay
•  Visible coolant leak or dried coolant residue
•  Low coolant warning
•  Cooling system pressure loss
•  Air trapped in the cooling system
•  Engine temperature fluctuations
•  Brittle, cracked or broken coolant line
•  Coolant seepage after previous cooling system work.

When to Replace
•  This Part If the original vent line is cracked, brittle, leaking or damaged
•  If coolant loss is traced to the vent line
•  During cooling system overhaul or hose replacement
•  When replacing related coolant pipes, hoses or thermostat components
•  If the cooling system is difficult to bleed correctly
•  During intake manifold or engine-top service where the line is disturbed
•  When recommissioning a vehicle with unknown cooling system history

Where It Fits on the Car
This coolant vent line fits in the engine cooling system, routed around the engine coolant pipework / breather circuit. It connects into the coolant venting system and helps remove air from the cooling circuit. Correct routing and secure connections are important to prevent leaks and maintain proper cooling system operation.

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

94610602661

The product you are viewing cross references to these numbers

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

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

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

99970182541

The product you are viewing cross references to these numbers

Sealing ring coolant connection. 



Fits:
Porsche 957 Cayenne 3.6ltr V6 - 2007 to 2010
Porsche 958 Cayenne 3.6ltr V6 - 2010 to 2017

Click 'Zoom in' for large parts diagram.
Diagram ref no 23


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

95510651100

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Thermostat Cover.

The Thermostat Cover is a OE MATCH cooling system component designed to securely house and seal the thermostat within the engine’s cooling circuit. This cover protects the thermostat assembly while ensuring a leak-free connection between the thermostat housing and connected coolant hoses.

Fits:

• Porsche 957 Cayenne 3.6L 2007-10
• Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17

Diagram Ref No 13

What This Product Does:

• Securing and sealing the thermostat assembly
• Maintaining correct coolant routing through the thermostat housing
• Ensuring proper cooling system pressure
• Preventing coolant leaks at the thermostat connection
• Supporting stable engine temperature regulation

Symptoms Of Wear Or Failure:

• Coolant leaks near the thermostat housing
• Visible cracks or damage to the cover
• Coolant smell from the engine bay
• Low coolant warning light
• Engine overheating due to coolant loss
• Coolant residue around housing connections

Why Replacement Matters:

• Prevent coolant leaks and system pressure loss
• Maintain proper thermostat operation
• Protect the engine from overheating damage
• Restore reliable cooling system performance
• Avoid costly engine repairs caused by heat-related issues

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

95510613100

The product you are viewing cross references to these numbers

Thermostat cover. 



Fits:
Porsche 957 Cayenne 3.6ltr V6 - 2007 to 2010
Porsche 958 Cayenne 3.6ltr V6 - 2010 to 2017

Click 'Zoom in' for large parts diagram.
Diagram ref no 13


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

95510613100

The product you are viewing cross references to these numbers

Water coolant distributor tube.



Fits:
Porsche 958 Cayenne 4.8L Turbo >>2014
Porsche 958 Cayenne 4.8L Turbo / Turbo S 2015-18

Click 'Zoom in' for large parts diagram.
Diagram ref no 1.

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

94810606121

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Water coolant hose - return.
This genuine OE hose routes coolant back to the engine’s cooling circuit, completing circulation from the engine back towards the overflow reservoir or cooling return path. It helps maintain correct engine temperature regulation by ensuring that coolant flows efficiently through the system, preventing overheating and supporting consistent thermal control under a wide range of driving conditions.

Fits:
Porsche 958 Cayenne S / GTS - 2010 to 2017
Porsche 970.1 Panamera 4 / 4S / GTS - 2009 to 2013
Porsche 970.2 Panamera GTS - 2014 to 2016

Diagram ref no 15

The Porsche Genuine OE Coolant Return Hose (Part No. 94810605124) is an original equipment engine cooling system hose assembly designed and manufactured to Porsche’s exact factory specifications. It’s a dedicated coolant return line (also referred to as a water return hose or coolant pipe) used in the closed-loop cooling system of specific Porsche V8 petrol engines.

This part has superseded the former numbers 94810605121, 94810605122, and 94810605123.

Coolant hoses endure thermal cycling, pressure variations, and exposure to antifreeze, which can lead to material degradation, swelling, cracks, and leaks over time. A failing coolant return hose can result in coolant loss, overheating, and potential engine damage. Replacing worn or deteriorated hoses with Genuine Porsche OE parts ensures correct dimensions, material resilience, and leak-free performance that aligns with factory cooling system specifications

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

94810605124

The product you are viewing cross references to these numbers

Water coolant hose - return
OE Match replacement coolant line designed to replicate the original Porsche hose in shape, length, material, and fitment. It serves as a return path for coolant within the engine cooling system, helping maintain proper circulation and temperature regulation.

Fits:
Porsche 958 Cayenne S / GTS - 2010 to 2017
Porsche 970.1 Panamera 4 / 4S / GTS - 2009 to 2013
Porsche 970.2 Panamera GTS - 2014 to 2016

Diagram ref no 15

The return hose carries coolant back toward the radiator or engine block after it has passed through the engine and other cooling components. Proper coolant flow is vital for maintaining stable engine temperatures, preventing overheating, and ensuring long-term engine longevity. A worn, cracked, or leaking hose can compromise coolant flow, lead to coolant loss, introduce air into the system, and result in overheating or engine damage.

This OE Match hose fits directly in place of the original and is supplied without additional clamps or fittings, allowing reuse of existing hardware or replacement with recommended clamps as needed. It’s ideal for coolant system maintenance, restoration work, or replacing age-affected components.

The coolant return hose completes the coolant circulation loop by transporting coolant back to the radiator/engine assembly after passage through the engine or heat exchangers. This return path helps maintain stable coolant temperatures and supports continuous heat dissipation.

Function:
• Provides a return path for coolant in the engine cooling system
•  Maintains proper coolant circulation and temperature control
•  Resists heat, pressure, and coolant breakdown
•  Design for direct fit and correct routing
•  Durable construction for long-term service

Coolant hoses deteriorate over time due to heat cycling, pressure, and exposure to coolant and engine bay contaminants. Cracks, bulges, or soft spots can develop, leading to coolant leaks, engine overheating, air ingress, and reduced cooling performance. Replacing aging hoses with an OE Match coolant return hose restores proper fluid flow, maintains engine operating temperature, and helps protect against costly engine damage.

When to replace:
•  Visible cracks, swelling, or soft spots
•  Coolant leaks or crusty coolant residue
•  Engine overheating or temperature fluctuations
•  During major coolant service (water pump, thermostat, belt service)
•  Routine preventative maintenance for older hoses

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

94810605124

The product you are viewing cross references to these numbers

Water coolant hose - return



Fits:
Porsche 958 Cayenne turbo - 2010 to 2017
Porsche 958 Cayenne turbo  S - 2010 to 2017

Click 'Zoom in' for large parts diagram.
Diagram ref no 15

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

94810605177

The product you are viewing cross references to these numbers

Water coolant hose - return



Fits:
Porsche 958 Cayenne turbo - 2010 to 2017
Porsche 958 Cayenne turbo  S - 2010 to 2017

Click 'Zoom in' for large parts diagram.
Diagram ref no 15

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

94810605177

The product you are viewing cross references to these numbers

Water coolant hose.



Fits:
Porsche 958 Cayenne 3.0L Diesel 2011-18
cars with Tiptronic transmission

Click 'Zoom in' for large parts diagram.
Diagram ref no 16

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95810654910

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Water Coolant Hose.

Maintain proper engine cooling and temperature control with the Water Coolant Hose. This OEM-quality hose is designed to carry coolant between key cooling system components, ensuring consistent circulation and efficient heat transfer.

Fits:

• Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
• Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17  

Diagram Ref No 7

What This Product Does:

• Carries coolant between key cooling system components
• Maintains steady coolant flow throughout the engine circuit
• Helps dissipate heat to prevent overheating
• Supports stable engine operating temperatures
• Ensures efficient cooling system performance

Symptoms Of Wear Or Failure:

• Coolant leaks under the vehicle or within the engine bay
  
• Low coolant warning light
• Frequent coolant top-offs
• Engine overheating or rising temperature gauge
  
• Sweet coolant smell from the engine compartment
  
• Steam from under the hood in severe cases
  
• Cracks, splits, or dry rot on the hose surface
  
• Bulging or swelling from internal weakening
  
• Soft, spongy, or brittle hose texture
• Coolant residue or dampness around hose fittings and clamps
  
  

Why Replacement Matters:

• Replacing a worn water coolant hose is essential to maintaining proper coolant circulation and engine temperature control. Over time, exposure to heat, pressure, and coolant can cause the hose to crack, weaken, or leak.
• If the hose fails, coolant loss can quickly lead to overheating and potentially serious engine damage. Even small leaks can reduce cooling efficiency and increase strain on other cooling system components.
• Installing a new hose helps prevent leaks, restore reliable coolant flow, and protect the engine from costly overheating-related repairs, ensuring long-term performance and reliability.

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

95810625110

The product you are viewing cross references to these numbers

Water Coolant Hose.

Maintain proper engine cooling and temperature control with the Water Coolant Hose. This OE MATCH hose is designed to carry coolant between key cooling system components, ensuring consistent circulation and efficient heat transfer.

Fits:

• Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
• Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17  

Diagram Ref No 7

What This Product Does:

• Carries coolant between key cooling system components
• Maintains steady coolant flow throughout the engine circuit
• Helps dissipate heat to prevent overheating
• Supports stable engine operating temperatures
• Ensures efficient cooling system performance

Symptoms Of Wear Or Failure:

• Coolant leaks under the vehicle or within the engine bay
  
• Low coolant warning light
• Frequent coolant top-offs
• Engine overheating or rising temperature gauge
  
• Sweet coolant smell from the engine compartment
  
• Steam from under the hood in severe cases
  
• Cracks, splits, or dry rot on the hose surface
  
• Bulging or swelling from internal weakening
  
• Soft, spongy, or brittle hose texture
• Coolant residue or dampness around hose fittings and clamps
  
  

Why Replacement Matters:

• Replacing a worn water coolant hose is essential to maintaining proper coolant circulation and engine temperature control. Over time, exposure to heat, pressure, and coolant can cause the hose to crack, weaken, or leak.
• If the hose fails, coolant loss can quickly lead to overheating and potentially serious engine damage. Even small leaks can reduce cooling efficiency and increase strain on other cooling system components.
• Installing a new hose helps prevent leaks, restore reliable coolant flow, and protect the engine from costly overheating-related repairs, ensuring long-term performance and reliability.

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

95810625110

The product you are viewing cross references to these numbers