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Transmission Cooling

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DISPLAYING 1 to 12 (of 12 products)
Special Order item
98710667400
Product Information
Product Information
Coolant pipe, feed.
Gear oil cooler.

porsche

Fits:
Porsche 987.1 Boxster 2005-08 Tiptronic transmission
Porsche 987C.1 Cayman 2005-08 Tiptronic transmission

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Diagram ref no 11

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98710667400
98710667400

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99630702001
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Gearbox oil cooler AFT basic plate. 18.64 x 3.53

porsche

Fits:
Porsche 996 (911) Carrera 2 (1998 - 2001)
Porsche 996 (911) Carrera 4 (1999 - 2001)
Porsche 996 (911) Turbo (2001 - 2001)
Porsche 996 (911) GT3 (1999 - 2001)
Porsche 996 (911) GT2 (2001 - 2001)
Additional information: Only in combination with Tiptronic.

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Diagram ref no 1.

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99630702001
99630701701
99630701700
99630702001

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99630701701
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Gearbox oil cooler AFT.

porsche

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-07 Tiptronic
Porsche 987C Cayman 2007-08 Tiptronic
Porsche 996 C2 / C4 >>2001 Tiptronic

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Diagram ref no 1.

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99630701701
99630701701
99630701700

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99630701701/2
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Gearbox oil cooler ATF.
Larger than standard. 15% larger than the original for better cooling.

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-07 Tiptronic
Porsche 987C Cayman 2007-08 Tiptronic
Porsche 996 C2 / C4 >>2001 Tiptronic

Diagram ref no 1.

The installation of a larger gearbox oil cooler for the Porsche 996, specifically for the Automatic Transmission Fluid (ATF), offers several significant benefits:

Enhanced Cooling Efficiency: A larger oil cooler increases the cooling capacity, allowing the ATF to dissipate heat more effectively. As a result, the transmission can operate at lower temperatures, preventing overheating and reducing the risk of fluid breakdown and premature wear on transmission components.

Extended Transmission Life: Lower operating temperatures due to improved cooling help prolong the lifespan of the transmission. Cooler ATF ensures that the internal components experience less stress and thermal degradation, contributing to a longer-lasting and more reliable gearbox.

Improved Performance: Optimal transmission temperature is essential for consistent and smooth gear shifts. With a larger oil cooler, the ATF maintains its viscosity and performance characteristics, promoting seamless gear changes and overall improved transmission performance.



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99630701701
99630701701
99630701700

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99630701701/1
Product Information
Product Information
Gearbox oil cooler ATF.

oematch

Fits:
Porsche 986 Boxster 1997-04 Tiptronic
Porsche 987 Boxster 2005-07 Tiptronic
Porsche 987C Cayman 2007-08 Tiptronic
Porsche 996 C2 / C4 >>2001 Tiptronic

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Diagram ref no 1.

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98630702000
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Mounting plate for Tiptronic gearbox heat exchanger.

porsche

Fits:
Porsche 986 Boxster 1997-04 Tiptronic (A8600 / A8605 / A8620)
Porsche 987.1 Boxster 2005-08 Tiptronic
Porsche 987C.1 Cayman 2006-08 Tiptronic (A8702 / A8721)

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Diagram ref no 5

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98630702000

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99970738840
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O-ring for gearbox oil cooler ATF
This Porsche Genuine OE O-Ring for Gearbox Oil Cooler ATF is a precision-engineered sealing ring used within the automatic (Tiptronic) transmission cooling system. This small but critical component provides a fluid-tight seal between the gearbox oil cooler and connecting pipework.
Sold individually

Fits:
Porsche 986 Boxster 1997 - 2004 Tiptronic
Porsche 987.1 Boxster 2005 - 2007 Tiptronic
Porsche 987C.1 Cayman 2007 - 2008 Tiptronic
Porsche 996 C2 / C4  / Turbo 1998 - 2005 Tiptronic
Porsche 997.1 C2 / C4  2005 - 2008 Tiptronic

Diagram ref no 2

Manufactured to Porsche OE standards, it ensures correct dimensions, material quality, and resistance to ATF (automatic transmission fluid), heat, and pressure.

This O-ring seals the junction between the gearbox oil cooler (heat exchanger) and its associated pipes, preventing ATF leaks and maintaining correct system pressure. By ensuring a secure seal, it allows the transmission fluid to circulate properly through the cooler, helping regulate temperature and maintain optimal gearbox performance.

Functions & Technical Role
•  Fluid sealing: Prevents ATF leaks at oil cooler connections
  Pressure retention: Maintains correct hydraulic pressure within the system
•  Thermal resistance: Designed to withstand high transmission temperatures
•  System protection: Prevents contamination and air ingress
•  OEM precision fit: Exact size and material specification for Porsche applications

Fitment / Position on car
  Fitting position: Transmission cooling system
  Location: Between gearbox oil cooler (ATF heat exchanger) and fluid pipes
  System: Automatic transmission (Tiptronic) lubrication and cooling

Although small, O-rings are critical wear items exposed to heat cycles, pressure, and fluid degradation. Over time they can harden, shrink, or crack, leading to:
  ATF leaks around the gearbox oil cooler
  Loss of transmission fluid and pressure
  Overheating of the gearbox
  Potential transmission damage

Replacing with a genuine Porsche OE O-ring ensures proper sealing, reliability, and long-term protection of the transmission system.

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99970738840
99970738840

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O-ring for gearbox oil cooler ATF, 18.64 x 3.53 mm
An OE Match O-ring seal designed for the automatic transmission (Tiptronic) oil cooler system, ensuring a tight, leak-free connection between the gearbox oil cooler and fluid lines.
Sold individually

Fits:
Porsche 986 Boxster 1997 - 2004 Tiptronic
Porsche 987.1 Boxster 2005 - 2007 Tiptronic
Porsche 987C.1 Cayman 2007 - 2008 Tiptronic
Porsche 996 C2 / C4  / Turbo 1998 - 2005 Tiptronic
Porsche 997.1 C2 / C4  2005 - 2008 Tiptronic

Diagram ref no 2

This OE Match O-Ring for Gearbox Oil Cooler ATF is a precision-engineered sealing component designed to meet original Porsche specifications for fit, durability, and performance. This O-ring is used within the automatic transmission oil cooler system, where it forms a critical seal between the cooler and associated fluid lines.

Despite its small size, this O-ring plays a vital role in maintaining the integrity of the transmission cooling circuit. It prevents leaks of automatic transmission fluid (ATF), ensuring proper lubrication and temperature regulation of the gearbox. Without an effective seal, fluid loss can occur, potentially leading to overheating, reduced lubrication, and long-term transmission damage.

Manufactured from high-quality heat- and fluid-resistant rubber, the O-ring is designed to withstand the demanding conditions of the transmission system, including exposure to high temperatures, pressure, and aggressive fluids. It is a direct replacement for original parts and ensures reliable sealing performance in both maintenance and repair applications.

This component is commonly used on Tiptronic-equipped Porsche models, making it an essential part during transmission servicing or oil cooler replacement.

Function
Provides a tight seal for gearbox oil cooler connections
•   Prevents ATF leaks and pressure loss
•   Maintains proper transmission cooling efficiency
•   Protects against fluid contamination and air ingress
•   Ensures reliable long-term sealing under heat and pressure

O-rings degrade over time due to heat, pressure, and exposure to transmission fluid. A worn or hardened seal can lead to ATF leaks, which may result in overheating, poor shifting performance, or serious transmission damage.

Replacing this O-ring during servicing ensures a proper seal and helps maintain the reliability and longevity of the transmission system.

When to replace
  During gearbox or oil cooler servicing
  Visible ATF leaks around cooler or lines
  O-ring appears cracked, flattened, or hardened
  Preventative replacement during transmission maintenance
  When removing or reinstalling cooler lines

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99970738840
99970738840

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98630708505
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Product Information
Return line gearbox cooler.

porsche

Fits:
For tiptronic transmission cars
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2006-08
Porsche 987C.1 Cayman 2006-08

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Diagram ref no 17

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98630708505
98630708505
98630708504

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98630708205
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Product Information
Supply line gearbox oil cooler

porsche

Fits:
For tiptronic transmission cars
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2006-08
Porsche 987C.1 Cayman 2006-08

Click 'Zoom in' for large parts diagram.
Diagram ref no 18

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98630708205
98630708205
98630708204

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Special Order item
92857457304::1
Product Information
Product Information
Transmission oil cooler thermostat.

porsche

Fits:
For cars with tiptronic gearbox
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2005-08
Porsche 987C.2 Cayman 2009-12
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo 2007-09
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13

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Diagram ref 8

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92857457304
92857457304
92857457303

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92857457304/1::1
Product Information
Product Information
Transmission oil cooler thermostat.

oematch

Fits:
For cars with tiptronic gearbox
Porsche 986 Boxster 1997-04
Porsche 987.1 Boxster 2005-08
Porsche 987.2 Boxster 2009-12
Porsche 987C.1 Cayman 2005-08
Porsche 987C.2 Cayman 2009-12
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo 2007-09
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13

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Diagram ref 8

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92857457304
92857457303

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DISPLAYING 1 to 12 (of 12 products)
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About Transmission Cooling

Porsche Transmission Cooling - Protect Gearbox Performance & Longevity

Porsche transmission cooling components are designed to regulate gearbox temperatures under load, helping maintain optimal oil viscosity, smooth shifting, and long-term transmission reliability. By dissipating excess heat generated during high-speed driving, towing, or track use, transmission coolers and associated components protect critical internal parts from premature wear and failure.

Available from Design911, Porsche transmission cooling solutions are ideal for both preventative maintenance and performance-focused upgrades, ensuring your gearbox operates within safe temperature limits.

What Do Porsche Transmission Cooling Components Do?

Transmission cooling systems manage heat build-up within the gearbox and transmission oil.

Core Functions:

  • Reduce gearbox and transmission oil temperatures
  • Maintain consistent lubrication under load
  • Prevent thermal breakdown of transmission fluid
  • Support smooth shifting and drivetrain efficiency
  • Protect internal gears, bearings, and seals

Effective transmission cooling is essential for sustained performance and durability.

Why Do Transmission Cooling Components Fail?

Transmission cooling components are exposed to heat, pressure, and environmental factors that can cause wear over time.

Common Causes of Failure:

  • Blocked or restricted cooling lines
  • Degraded hoses or seals due to heat cycling
  • Oil cooler contamination or internal blockage
  • Physical damage from road debris
  • Increased thermal load from performance driving

When cooling efficiency drops, transmission temperatures rise, accelerating internal wear.

When Should Transmission Cooling Components Be Replaced?

Porsche transmission cooling parts should be inspected or replaced if any of the following occur:

  • Rising transmission temperatures or warning messages
  • Transmission fluid leaks around cooler lines
  • Burnt or degraded gearbox oil
  • Poor shifting performance under load
  • During gearbox servicing or performance upgrades

Replacing worn cooling components early helps prevent costly gearbox repairs.

Highlights

  • Essential Porsche gearbox cooling components
  • Helps control transmission oil temperatures
  • Protects internal gearbox parts from heat damage
  • Suitable for road, fast-road, and track use
  • OEM-spec and performance-focused solutions       

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