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Porsche > Panamera 971 MK2 (2021-2023) > Engine Cooling >

Coolant Hoses and Pipes (Rear engine cars)

Coolant Hoses and Pipes (Rear engine cars)

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Water / Coolant pipe O-ring 22 x 3 mm for Porsche Various Models - 99970751740, 99970751741
1
Water / Coolant pipe O-ring 22 x 3 mm for Porsche Various Models
Special Order item
99970751741
Product Information
Product Information
Water / Coolant pipe O-ring 22 x 3 mm
This Porsche Genuine OE O-Ring (Part No. 99970751741) is a precision-engineered sealing ring (22 x 3 mm) used within the engine cooling system, specifically at water/coolant pipe connections. It is commonly referred to as a coolant pipe O-ring, water inlet O-ring, or thermostat housing seal.
Sold individually

Fits:
O-Ring 99970751741 is widely used across multiple Porsche models, including:
Porsche 911 (997.2 / 991)
Porsche Boxster (987.2 / 981 / 982)
Porsche Cayman (987C.2 / 981C / 982C )
Porsche Cayenne (955 / 9YA)
Porsche Panamera (971 / 976)

Fitment / Position on car
•  Fitting position: Engine cooling system
•  Location: At coolant pipe joints / water inlet connections / thermostat housing
•  System: Engine cooling / coolant circulation

Cross Reference / Superseded Numbers: 99970751740 - replaced by 99970751741

The Porsche Genuine OE Coolant Pipe O-Ring 99970751741 is a small but essential sealing component used across many Porsche models. It ensures a leak-free connection within the cooling system, maintaining proper coolant flow, pressure, and engine temperature control. As a genuine Porsche part, it guarantees exact fitment and durability.

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Related, superseded, cross reference or alternative numbers for comparison.

99970751741
99970751740
99970751741

The product you are viewing cross references to these numbers
Water / Coolant pipe O-ring 22 x 3 mm for Porsche Various Models - 99970751740, 99970751741
1
Water / Coolant pipe O-ring 22 x 3 mm for Porsche Various Models
99970751741/1
Product Information
Product Information
Water / Coolant pipe O-ring 22 x 3 mm
This OE Match O-Ring (22 x 3 mm) is a high-quality replacement sealing component designed to meet original Porsche specifications for fit, durability, and performance. This O-ring is used within the engine cooling system, sealing coolant pipe connections to prevent leaks and maintain system pressure.
Sold individually

Fits:
O-Ring 99970751741 is widely used across multiple Porsche models, including:
Porsche 911 (997.2 / 991)
Porsche Boxster (987.2 / 981 / 982)
Porsche Cayman (987C.2 / 981C / 982C )
Porsche Cayenne (955 / 9YA)
Porsche Panamera (971 / 976)

This O-ring is commonly used across a wide range of Porsche models and is essential when removing or reinstalling coolant pipes, housings, or related components. As with all sealing elements, it should always be replaced during servicing to ensure optimal performance and prevent future leaks.

Fitment & Application:
•  Suitable for various Porsche models
•  Commonly used in engine cooling systems
•  Function: Prevents coolant leaks and maintains system pressure
•  Position: Coolant pipes / hose connections / housing joints
•  Size: 22 mm inner diameter x 3 mm thickness
•  Sold: Individually

Cross Reference / Superseded Numbers: 99970751740 - replaced by 99970751741

Coolant system O-rings are exposed to constant heat and chemical exposure, causing them to harden, crack, or lose elasticity over time. A failing seal can lead to coolant leaks, overheating, and potential engine damage. Replacing O-rings during servicing ensures proper sealing, prevents leaks, and maintains reliable cooling system operation.

When to replace
•  During coolant pipe or housing removal
•  Visible coolant leaks or residue
•  O-ring appears flattened, brittle, or cracked
•  Preventative replacement during cooling system service
•  After engine overheating incidents

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

99970751741
99970751740
99970751741

The product you are viewing cross references to these numbers
DISPLAYING 1 to 2 (of 2 products)
About Coolant Hoses and Pipes (Rear engine cars)

High-Quality Coolant Hoses & Pipes for Reliable Engine Cooling and Temperature Control

Coolant hoses and pipes are essential components in the engine’s cooling system, responsible for circulating coolant between the radiator, water pump, thermostat housing and engine block. These hoses must withstand constant temperature fluctuations, pressure changes and exposure to coolant chemicals. A reliable coolant line system ensures stable engine temperatures, prevents overheating and protects internal engine components from heat-related damage.

Whether restoring a classic, repairing leaks or upgrading to more durable materials, replacing old coolant hoses and pipes is critical for maintaining consistent cooling performance.

What Coolant Hoses & Pipes Do

Coolant hoses and pipes perform multiple key functions:

  • Transport coolant throughout the engine cooling circuit
  • Maintain stable engine temperature during all driving conditions
  • Absorb vibration and engine movement to prevent leaks
  • Channel coolant between major components including radiator, heater core and expansion tank
  • Support proper thermostat operation by ensuring consistent flow
  • Prevent overheating during high-load driving or hot climates

Without dependable hoses and pipes, the cooling system cannot maintain correct operating temperatures.

Why Coolant Hoses & Pipes Commonly Fail

Because they are exposed to heat, pressure and chemical corrosion, coolant hoses and pipes naturally degrade over time. Common causes of failure include:

  • Cracking or hardening due to prolonged heat cycling
  • Swelling or soft spots caused by chemical breakdown
  • Corrosion inside metal coolant pipes
  • Leaks from worn hose clamps or fittings
  • Abrasion damage from rubbing against engine components
  • Internal collapse, restricting coolant flow
  • Age-related deterioration in rubber or plastic hoses

Symptoms may include visible coolant leaks, overheating, steam from under the bonnet, fluctuating temperature gauge or a sweet coolant smell.

Why You Should Replace Worn Coolant Hoses & Pipes

Replacing aged or damaged hoses with high-quality, precision-built alternatives designed to match original cooling performance ensures your engine stays safe, efficient and protected from heat-related failure.

Benefits include:

  • Restored coolant flow and stable operating temperatures
  • Reduced risk of overheating and head gasket damage
  • Improved reliability during long-distance or high-performance driving
  • Better pressure resistance and durability with upgraded materials
  • Prevention of sudden coolant loss or breakdowns
  • Longer service life for the entire cooling system

Upgrading to reinforced hoses or corrosion-resistant pipes can also enhance long-term cooling system performance.

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