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Porsche > Panamera 971 MK2 (2021-2023) > 971.2 Panamera GTS Sport Turismo 4.0L V8 2021-23 > Gearbox / Transmission > Transmission Cooling >

Pipes

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Speed nut M6. Porsche 955 / 957 / 958 Cayenne / 971 Panamera / 9J1 Taycan - N90168604, N 90168604 - 36418
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Speed nut M6. Porsche 955 / 957 / 958 Cayenne / 971 Panamera / 9J1 Taycan
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N90168604/1
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Speed nut M6. 
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Fits:

Porsche 955 Cayenne - 2003 to 2006
Porsche 957 Cayenne - 2007 to 2010
Porsche 958 Cayenne - 2010 to 2017
Porsche 971 Panamera - 2017 to 2023
Porsche 9J1 Taycan - 2020 to 2024



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About Pipes

Porsche Transmission Coolant Pipes - Essential Gearbox Cooling Flow Components

Porsche transmission coolant pipes carry coolant between the gearbox, coolant control valves, and transmission oil coolers, ensuring consistent temperature regulation under all driving conditions. By maintaining correct coolant flow, these pipes protect transmission oil, seals, and internal components from overheating and premature wear.

Available from Design911, transmission coolant pipes are supplied to OEM specifications, making them suitable for maintenance, repairs, and complete cooling system refurbishments.

What Do Porsche Transmission Coolant Pipes Do?

Transmission coolant pipes form the physical flow network of the gearbox cooling system.

Core Functions:

  • Transport coolant to and from the transmission oil cooler
  • Maintain stable gearbox operating temperatures
  • Support efficient transmission oil cooling
  • Prevent thermal stress on internal gearbox components
  • Enable correct operation of coolant control and change over valves

Healthy coolant pipes are essential for reliable transmission thermal management.

Why Do Transmission Coolant Pipes Fail?

Transmission coolant pipes are exposed to heat, pressure, vibration, and environmental conditions.

Common Causes of Failure:

  • Corrosion in metal pipes from age or coolant degradation
  • Cracking or hardening of plastic and rubber sections
  • Heat cycling causing material fatigue
  • Leaks at pipe joints or O-ring connections
  • Physical damage from road debris or incorrect installation

Failure can result in coolant loss, overheating, and transmission damage.

When Should Transmission Coolant Pipes Be Replaced?

Porsche transmission coolant pipes should be inspected and replaced when signs of deterioration appear.

Replacement Indicators:

  • Visible coolant leaks or staining
  • Cracked, swollen, or brittle pipe sections
  • Repeated low coolant warnings
  • Overheating or inconsistent transmission temperatures
  • During transmission or cooling system servicing

Preventative replacement helps avoid sudden coolant loss and expensive gearbox repairs.

Highlights

  • Essential Porsche gearbox cooling system components
  • Maintains reliable coolant flow and temperature control
  • OEM-spec fitment and durability
  • Suitable for road, fast-road, and performance applications
  • Helps prevent overheating and premature gearbox wear       

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