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Porsche // 997 (911) MK2 2009-2012 // Any
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Heater Cycling Timing Valve.
The Genuine Porsche Heater Cycling Timing Valve (Part Number: 95965312500) is an original equipment heating system component designed for the Porsche 959, manufactured between 1987 and 1988.
Fits:
Diagram Ref No 17
Developed to Porsche's original specifications, this specialised valve forms part of the vehicle's heating and ventilation system, helping regulate the circulation of heated coolant through the passenger compartment heating circuit.
The cycling valve works within the heater control system to manage coolant flow according to heating requirements, supporting consistent cabin temperature regulation and passenger comfort.
The Porsche 959 features a sophisticated heating and ventilation arrangement, incorporating a dedicated coolant circulation pump, control valves and associated hoses. The heater cycling timing valve helps regulate the flow of heated coolant within this system, allowing cabin heating to be controlled.
Over time, the valve may deteriorate due to ageing, repeated operating cycles, exposure to heated coolant and internal mechanical or electrical faults. A malfunctioning valve can result in inconsistent cabin heating, poor temperature control or unwanted heat when the heating system should be reduced.
Replacing a defective valve with a Genuine Porsche component helps restore the original heating system functionality while preserving the authenticity and engineering integrity of this highly collectible Porsche model.
Ideal for heating system repairs, climate control maintenance and concours-level Porsche 959 restoration projects, this Genuine Porsche Heater Cycling Timing Valve provides a replacement for the original component.
What This Product Does:
The heater cycling timing valve is a control component within the Porsche 959's passenger compartment heating system.
Its primary function is to regulate the passage of heated coolant through the heating circuit, helping control the amount of heat available to the cabin heater.
Working alongside the heater circulation pump, associated coolant hoses and heating controls, the cycling valve helps manage coolant movement according to the demands of the passenger compartment heating system.
Rather than operating solely as a manually positioned valve, the cycling arrangement regulates heating through controlled valve operation.
Its main functions include:
- Regulating heater coolant flow: Helps control the circulation of heated coolant through the passenger compartment heating circuit.
- Supporting cabin temperature control: Allows the heating system to adjust heat delivery according to passenger compartment requirements.
- Controlling heating cycles: Provides controlled valve operation as part of the heating system's temperature regulation process.
- Maintaining heating consistency: Helps prevent excessive or insufficient heat delivery during normal operation.
- Supporting heater circulation: Works alongside the dedicated coolant pump and associated heating system components.
- Improving passenger comfort: Contributes to dependable cabin heating in varying external temperatures.
- Maintaining original heating functionality: Preserves the intended operation of the Porsche 959 heating and ventilation system.
Symptoms Of Wear Or Failure:
The heater cycling timing valve operates within a demanding environment, exposed to coolant temperatures, repeated operating cycles and ageing electrical and mechanical components.
Over time, internal deterioration, contamination, electrical faults or damage to the valve mechanism may interfere with correct operation.
Common symptoms of a worn or faulty heater cycling timing valve include:
- Insufficient cabin heating: A valve that fails to open correctly may restrict heated coolant circulation, resulting in weak or ineffective heating.
- Constant hot air: A valve stuck in an open position may allow unwanted heating even when a lower cabin temperature is selected.
- Inconsistent cabin temperature: Irregular valve operation may cause fluctuations in heater output.
- Intermittent heater operation: Electrical faults or a sticking mechanism may cause the heating system to work unpredictably.
- Slow cabin warm-up: Restricted coolant circulation may increase the time required for the passenger compartment to reach the desired temperature.
- Heater not responding to controls: A faulty valve may prevent the heating system from responding correctly to temperature adjustments.
- Coolant leakage: Deteriorated seals, connections or valve housing damage may allow coolant to escape.
- Visible corrosion or contamination: Ageing and coolant deterioration may cause deposits or corrosion around the valve and its connections.
- Electrical connection faults: Damaged wiring, corroded terminals or poor connections may interfere with valve operation.
- Valve sticking or seizure: Internal deposits or mechanical deterioration may prevent the valve from cycling correctly.
Why Replacement Matters:
Replacing a defective heater cycling timing valve is important for maintaining reliable passenger compartment heating and preserving the original functionality of the Porsche 959's climate control system.
A malfunctioning valve may prevent the heating circuit from regulating coolant flow correctly, resulting in inconsistent heating, excessive cabin temperatures or insufficient warmth during cold conditions.
If the valve develops a coolant leak, continued operation may also lead to coolant loss and contamination of surrounding components.
Installing a Genuine Porsche replacement Heater Cycling Timing Valve helps to:
- Restore accurate heating control: Reinstate the intended regulation of heated coolant within the cabin heating circuit.
- Improve cabin comfort: Help maintain consistent and predictable passenger compartment temperatures.
- Resolve unwanted heating: Address excessive heat caused by a valve that remains open.
- Restore effective cabin heating: Correct restricted coolant flow caused by a confirmed defective valve.
- Maintain heating system reliability: Replace ageing or malfunctioning valve components.
- Prevent coolant leakage: Restore secure coolant containment where the valve itself is leaking.
- Support correct heater circulation: Maintain effective operation alongside the heater pump and associated components.
- Protect surrounding components: Reduce the risk of damage from coolant leaks or deterioration.
- Preserve original Porsche engineering: Maintain the intended heating system configuration using a Genuine Porsche component.
- Support classic vehicle restoration: Restore the heating and ventilation system while retaining the vehicle's original specification.
- Maintain vehicle authenticity: Use the correct Porsche reference for a rare and historically significant model.
Replacing the valve is particularly recommended when investigation confirms incorrect valve cycling, mechanical seizure, internal failure or leakage.
For Porsche 959 vehicles undergoing extensive restoration, inspecting the heater circulation pump, coolant hoses, electrical connections and associated heating controls is also advisable.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95965312500
The product you are viewing cross references to these numbers
- 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 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
Fits:
Porsche 987 Boxster
Porsche 987.2 Boxster
Porsche 987C Cayman
Porsche 987C.2 Cayman
Porsche 997 Carrera / Turbo
Porsche 997.2 Carrera / Turbo
Click 'Zoom in' for large parts diagram.
Diagram ref no 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99757246301
The product you are viewing cross references to these numbers
- 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 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- 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 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 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 GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- 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
Fits:
For left-hand drive cars (LHD)
Porsche 986 Boxster 1998-04
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 1998-05
Porsche 997.1 2005-08
Porsche 997.2 2009-12
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99657226302
The product you are viewing cross references to these numbers
- 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 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- 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 MK1 GT3 / GT3 RS 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 GT3 / GT3 RS 2010-11
- 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
Fits:
For RHD cars
Porsche 986 Boxster 1997-04
Porsche 996 Boxster 1998-05
Porsche 987 Boxster 2005-08
Porsche 987.2 Boxster 2009-12
Porsche 987C Cayman 2006-08
Porsche 987C.2 Cayman 2009-12
Porsche 997.1 Carrera 2005-08
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99757255301
The product you are viewing cross references to these numbers
- 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 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- 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 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 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 GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- 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
Fits:
For RHD cars
Porsche 996 Carrera 1998-05
Porsche 996 Turbo 2001-05
Porsche 996 GT3 1999-05
Porsche 986 Boxster 1997-05
Porsche 987.1 Boxster 2005-08
Porsche 987.2 Boxster 200-12
Porsche 987C.1 Cayman 2006-08
Porsche 987C.2 Cayman 2009-12
Porsche 997.1 Carrera 2005-08
Porsche 997.1 Turbo 2007-10
Porsche 997 GT3 2007-11
Porsche 997.2 Carrera 2009-12
Porsche 997.2 Turbo 2010-13
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99757255501
The product you are viewing cross references to these numbers