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Coolant Control Valve / Change Over Valves
By OE Match
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII Turbo 2010-13
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Transmission oil cooler thermostat
OE Match transmission oil cooler thermostat for the listed Porsche Boxster, Cayman, 996 and 997 applications. This replacement component forms part of the transmission cooling system.
Fits
For cars with Tiptronic gearbox
- Porsche 986 Boxster 1997 - 2004
- Porsche 987.1 Boxster 2005 - 2008
- Porsche 987.2 Boxster 2009 - 2012
- Porsche 987C.1 Cayman 2005 - 2008
- Porsche 987C.2 Cayman 2009 - 2012
- Porsche 996 Carrera 1998 - 2005
- Porsche 996 Turbo 2001 - 2005
- Porsche 997.1 Carrera 2005 - 2008
- Porsche 997.1 Turbo 2007 - 2009
- Porsche 997.2 Carrera 2009 - 2012
- Porsche 997.2 Turbo 2010 - 2013
Diagram ref no 8
What This Product Does
The thermostat is a control component within the transmission cooling arrangement, helping regulate its operation rather than serving as the oil cooler itself. OE Match develops replacement parts around Porsche applications, using original references and component specifications when assessing fit and function.
Symptoms of Fault
Transmission temperature warnings, rough changes when hot, delayed engagement or fluid leakage can justify inspecting the cooling system. These signs do not establish thermostat failure: cooler restrictions, damaged lines, seals and other transmission faults may produce similar symptoms.
Why Replacement Matters
Renewal is appropriate when diagnosis identifies a defective control component. Inspect associated hoses, connections and seals during the repair, and match the replacement to the vehicle's transmission specification.
FAQs
Will flushing resolve a faulty thermostat?
Flushing may address contamination, but it does not repair a defective component or leaking connection.
Does difficult shifting confirm a cooling fault?
No. Fluid condition, transmission controls and other drivetrain components should also be assessed before replacement.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857457305
The product you are viewing cross references to these numbers
Porsche Transmission Coolant Control & Change Over Valves - Intelligent Gearbox Temperature Management
Porsche transmission coolant control valves, also known as change over valves, regulate the flow of coolant to the gearbox and transmission oil cooler. These valves ensure the transmission reaches optimal operating temperature quickly, then maintains stable cooling under load, improving efficiency, shift quality, and long-term gearbox reliability.
Available from Design911, transmission coolant control and change over valves are supplied to OEM standards, making them ideal for preventative maintenance, fault repair, and performance-focused thermal management.
What Do Transmission Coolant Control / Change Over Valves Do?
These valves manage when and how coolant is routed through the transmission cooling circuit.
Core Functions:
- Regulate coolant flow to the transmission oil cooler
- Help the gearbox warm up efficiently from cold
- Prevent over-cooling during light driving conditions
- Increase cooling during high load or high temperature operation
- Maintain consistent transmission oil temperature
Proper valve operation ensures balanced thermal control in all driving conditions.
Why Do Transmission Coolant Control Valves Fail?
Transmission coolant control valves operate in harsh thermal environments and are subject to wear over time.
Common Causes of Failure:
- Internal valve sticking due to coolant contamination
- Electrical actuator or solenoid failure
- Seal degradation from heat cycling
- Coolant leaks caused by cracked housings
- Age-related plastic fatigue
When these valves fail, transmission temperatures can fluctuate or remain outside optimal ranges.
When Should Transmission Coolant Control Valves Be Replaced?
Porsche transmission coolant control and change over valves
should be replaced if any of the following symptoms are present:
- Transmission overheating or slow warm-up
- Warning lights or fault codes related to temperature control
- Inconsistent or harsh gear shifts when hot or cold
- Coolant leaks around the valve housing
- During gearbox or cooling system servicing
Early replacement helps prevent overheating, poor shifting, and premature gearbox wear.
Highlights
- Critical transmission thermal management components
- Regulates gearbox coolant flow and oil temperature
- Maintains efficient warm-up and cooling balance
- OEM-spec reliability for long-term durability
- Essential for both road and performance driving
