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Porsche // 964 (911) (1989-1994) // 964 (911) C4 1989-93
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Relays / Sensors / Resistors
- 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 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- 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 Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
Fits:
For cars with air conditioner (M:573)
Porsche 968 1992 - 1995
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 1998 - 2005
Porsche 997.1 2005 - 2008
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987C.1 Cayman 2006 - 2008
* Please check and match the part number of your relay in your car before ordering.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99965701890
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 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- 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 Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
OE Match air conditioner relay for Porsche 968, 964, 993, 996, 997.1, Boxster, and Cayman models. This replacement electrical relay helps restore correct air conditioning system operation by controlling power supply to the relevant A/C circuit.
Fits:
For cars with air conditioner (M:573)
Porsche 968 1992 - 1995
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 1998 - 2005
Porsche 997.1 2005 - 2008
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987C.1 Cayman 2006 - 2008
*** Please check and match the part number of your relay in your car before ordering ***
The air conditioner relay switches electrical power to the A/C system when requested by the climate control or air conditioning controls. A correctly working relay helps ensure the air conditioning system can engage and operate reliably.
Functions
• Replaces the air conditioner relay
• Helps control A/C system electrical switching
• Supports correct compressor or A/C circuit engagement
• Helps restore reliable air conditioning operation
• Suitable for fault diagnosis and A/C electrical repair
• OE Match replacement for Porsche climate control service
Why Replace This Part?
Air conditioner relays can fail due to age, heat, electrical load, corrosion, internal contact wear, or moisture exposure. A faulty relay may cause the A/C system to stop working, work intermittently, fail to engage, or show inconsistent cooling performance. Replacing the relay can help restore reliable electrical switching within the air conditioning system.
When to Replace This Part
• Air conditioning does not switch on
• A/C operation is intermittent
• Compressor or A/C circuit is not receiving power
• Climate control fault diagnosis points to relay failure
• Existing relay is corroded, overheated, or damaged
• A/C electrical repair or restoration is being carried out
• Preventive replacement is required during climate system service.
Where it fits on the car
This relay fits within the vehicle electrical relay / fuse system for the air conditioning circuit. Location can vary depending on model and year.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99965701890
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
The Genuine Porsche Air Conditioning Pressure Switch (Part Number: 96461313700) is an original equipment electrical component designed to monitor refrigerant pressure within the air conditioning system of selected Porsche 911 (964), 944 and 968 models.
Fits:
- Porsche 964 (911) C2 1989-92
- Porsche 964 (911) C4 1989-92
- Porsche 964 (911) RS 3.6L 1991-92
- Porsche 964 (911) RS 3.8L 1991-92
- Porsche 964 (911) TURBO 3.3L 1991-92
- Porsche 964 (911) TURBO 3.6L 1991-92
- Porsche 944S2 3.0L 16V 1989-91
- Porsche 968 3.0L 1992-92
- Porsche 968 Sport 3.0L 1994-92
- Porsche 968 CS 3.0L 1993-92
- Porsche 968 Turbo S 3.0L 1993-92
Diagram Ref No 15
Manufactured to Porsche's original equipment specifications, this pressure switch plays an important role in protecting the air conditioning compressor and maintaining reliable climate control operation.
Installed within the refrigerant circuit, the switch monitors system pressure and provides an electrical switching signal when specified pressure conditions are reached. This allows the air conditioning control system to prevent compressor operation when refrigerant pressure is outside the permitted operating range.
Correct refrigerant pressure is essential for efficient air conditioning performance. Insufficient refrigerant pressure may indicate a leak or inadequate system charge, while excessive pressure can place unnecessary stress on the compressor, refrigerant lines and other air conditioning components.
Over time, the original pressure switch may deteriorate due to ageing, vibration, moisture exposure, electrical contact wear or internal mechanical failure. A faulty switch can prevent the compressor from operating correctly, resulting in intermittent cooling or complete air conditioning failure.
Replacing a defective switch with a Genuine Porsche component helps restore the intended pressure monitoring and compressor protection functions while maintaining the vehicle's original climate control system.
Ideal for air conditioning repairs, refrigerant circuit servicing and classic Porsche restoration projects, this Genuine Porsche pressure switch provides a replacement for compatible vehicles.
What This Product Does:
The air conditioning pressure switch is an important safety and control component within the vehicle's refrigerant circuit.
Its primary function is to respond to refrigerant pressure and provide an electrical signal that allows or prevents air conditioning compressor operation according to the system's operating requirements.
During normal operation, the compressor circulates refrigerant through the condenser, expansion device and evaporator to remove heat from the passenger compartment.
The pressure switch helps protect the system by preventing compressor operation when the monitored pressure falls outside its specified range.
Its main functions include:
- Monitoring refrigerant pressure: Detects specified pressure conditions within the air conditioning circuit.
- Protecting the compressor: Helps prevent compressor operation when refrigerant pressure is unsuitable.
- Supporting reliable cabin cooling: Allows compressor operation when the required pressure conditions are satisfied.
- Reducing the risk of compressor damage: Helps protect against operation under excessively low refrigerant pressure conditions.
- Supporting refrigerant system safety: Provides pressure-dependent electrical control within the air conditioning system.
- Maintaining climate control functionality: Works with the vehicle's air conditioning electrical circuit to support dependable operation.
- Responding to abnormal pressure conditions: Helps prevent continued compressor operation when pressure-related safety limits are reached.
- Preserving original Porsche specifications: Maintains the intended pressure-switching arrangement of the original air conditioning system.
Symptoms Of Wear Or Failure:
Air conditioning pressure switches are exposed to refrigerant pressure changes, engine compartment temperatures, vibration and environmental conditions.
Over time, the switch's internal contacts, pressure-sensitive mechanism or electrical connections may deteriorate, causing incorrect or intermittent switching.
Common symptoms of a worn or faulty air conditioning pressure switch include:
- Air conditioning not working: A defective switch may prevent the compressor from engaging, resulting in no cold air from the vents.
- Intermittent cabin cooling: Faulty electrical contacts may cause compressor operation to become inconsistent.
- Warm air from the vents: A pressure switch that incorrectly interrupts compressor operation may prevent effective cooling.
- Compressor not engaging: The compressor clutch may fail to activate even when the system contains the correct refrigerant charge.
- Unpredictable compressor cycling: Intermittent switching faults may cause the compressor to engage and disengage unexpectedly.
- Reduced cooling performance: Incorrect pressure-switch operation may interrupt the refrigeration cycle.
- Damaged electrical connections: Corroded terminals, loose connectors or damaged wiring may interfere with the switch signal.
- Refrigerant leakage around the switch: Deteriorated seals or damage around the pressure switch connection may allow refrigerant to escape.
- Visible corrosion or deterioration: Moisture and ageing may damage the switch housing or connector terminals.
- Incorrect pressure-switch continuity: Electrical testing may show that the switch does not open or close as specified at the relevant pressure conditions.
- Repeated air conditioning shutdown: A faulty pressure switch may interrupt compressor operation despite otherwise normal system conditions.
Why Replacement Matters:
Replacing a defective air conditioning pressure switch is important for restoring dependable cabin cooling and protecting the compressor against unsuitable operating conditions.
A malfunctioning pressure switch may incorrectly prevent the compressor from engaging, leaving the vehicle without effective air conditioning even when other system components are functioning correctly.
Alternatively, a switch that fails to respond to abnormal pressure conditions may compromise the compressor protection function intended by the original system design.
Installing a Genuine Porsche replacement Air Conditioning Pressure Switch helps to:
- Restore compressor control: Reinstate pressure-dependent switching for correct air conditioning operation.
- Improve cabin cooling reliability: Help eliminate intermittent cooling caused by defective switch contacts.
- Protect the air conditioning compressor: Maintain the intended safeguards against unsuitable refrigerant pressure.
- Support system safety: Restore the electrical response to abnormal refrigerant pressure conditions.
- Reduce unnecessary compressor wear: Help prevent operation when refrigerant conditions are outside the specified range.
- Resolve pressure-switch-related faults: Address air conditioning problems caused by a confirmed defective switch.
- Maintain reliable climate control: Support consistent air conditioning performance during everyday driving.
- Preserve original functionality: Restore the intended factory refrigerant pressure monitoring arrangement.
- Support classic Porsche maintenance: Replace ageing electrical components during air conditioning refurbishment.
- Maintain Genuine Porsche quality: Use a replacement component specified for the applicable Porsche refrigerant system.
Replacing the pressure switch is particularly recommended when diagnostic testing confirms incorrect switching behaviour, damaged electrical connections or leakage originating from the switch assembly.
For older Porsche vehicles, inspecting the complete air conditioning circuit during repairs is advisable to identify refrigerant leaks, deteriorated hoses, damaged connectors and other ageing components.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96461313700
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
The Electrocooler electric air conditioning system for Porsche 964/993 is an update to the original factory A/C system using an electric compressor pump.
• Fits vehicles with or without factory AC
The 964/993 blower unit and fans are retained but everything else is replaced.
Kit is supplied with or without High Performance Evaporators, all other parts are provided. If factory evaporator is required please use 96457390100
• All Electric. All modern components
• Weighs around 22 lbs (10 kg)
• Fits in front of vehicle
• Lightweight narrow hose set weighing under 4lbs (1.5kg)
• Easy Install. Bolt-in installation
• Clutter Free. Uses the standard fresh air vents to deliver cool air
• Simple to Use. Control by a single 'smart button' or original CCU
• Energy Efficient. Uses less than 1 HP of engine power
• Fits all models of 964 / 993 including RS
• Fits vehicles with or without factory AC
All 964 systems are now shipped with two condensers for increased cooling performance. Check our installation guide HERE for details on second condenser fitment.
Please note! Our electric air conditioning likes a healthy current. We recommend upgrading the original alternator in the vast majority of installations. Porsche 964 and 993 models are less affected but may still benefit.
PLEASE NOTE:
Due to its size, weight or fragility, this item requires additional protective packaging to make sure it reaches you undamaged. A small packing surcharge is applied to cover these specialist materials and the extra care taken preparing your order for transit.
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Fits:
Porsche 964 1989-94
Porsche 993 1994-97
* Please check and match the part number of your relay in your car before ordering.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG95125400
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
Fits:
Porsche 964 1989-94
Porsche 993 1994-97
* Please check and match the part number of your relay in your car before ordering.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG95125400
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Fits:
Porsche 964 - 1989 to 1994
Click 'Zoom in' for large parts diagram.
Diagram ref no 41
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96461894300
The product you are viewing cross references to these numbers
Porsche HVAC Relays, Sensors & Resistors | Precision Climate Control & System Reliability
Relays, sensors, and resistors are vital components in your Porsche’s heating and air conditioning system. They ensure the correct operation of fans, blowers, and temperature control systems by managing electrical flow, monitoring environmental conditions, and regulating motor speeds. A properly functioning electrical control system ensures reliable, efficient, and responsive climate control performance.
At Design911, we supply premium relays, sensors, and resistors engineered to meet or exceed original performance specifications. Built with high-quality materials and advanced circuitry, these components provide dependable electrical performance and long service life, ensuring your Porsche’s HVAC system operates as smoothly as intended.
Whether you’re diagnosing inconsistent airflow, fan speed issues, or erratic temperature readings, our range of Porsche HVAC relays, sensors, and resistors delivers precise performance, compatibility, and durability.
What Do HVAC Relays, Sensors & Resistors Do?
These components work together to regulate the electrical and mechanical functions of the climate control system.
Core Functions:
- Relays:
Control power to components like blower motors and compressors.
- Sensors:
Monitor temperature, pressure, and humidity for automatic climate
adjustment.
- Resistors:
Regulate fan speeds and motor operation.
- Maintain efficient, stable heating and cooling performance.
- Protect sensitive electrical components from overloads.
Without functioning relays, sensors, or resistors, the HVAC system may deliver erratic airflow, inaccurate temperatures, or fail to operate entirely.
Why Do HVAC Relays, Sensors & Resistors Fail or Malfunction?
Electrical components endure constant voltage changes, heat cycles, and vibration — all of which can lead to degradation over time.
Common Causes of Failure Include:
- Corrosion or oxidation on terminals and connectors.
- Overheating or short circuits caused by electrical surges.
- Moisture ingress or condensation.
- Burnt-out resistors due to high current load.
- Age-related sensor drift or internal failure.
When these components fail, you may notice intermittent fan
operation, incorrect cabin temperature readings, or total loss of heating and
cooling functionality.
Why Replace Your Porsche HVAC Relays, Sensors & Resistors?
Replacing worn or faulty electrical components restores climate control accuracy and ensures your HVAC system functions efficiently and safely.
Key Benefits:
- Restores proper temperature regulation and fan control.
- Prevents electrical faults and inconsistent airflow.
- Improves reliability and system efficiency.
- Ensures accurate sensor readings for stable operation.
- Compatible with Porsche 911, Boxster, Cayman, Panamera, Macan, Cayenne, and classic models.
- Ideal for diagnostics, maintenance, and complete system refurbishments.
Replacing these components during HVAC servicing helps prevent secondary issues like burnt connectors, blown fuses, or motor failure.
Highlights
- Precision-engineered Porsche HVAC relays, sensors, and resistors.
- Designed for accuracy, reliability, and thermal efficiency.
- Durable, corrosion-resistant materials for long service life.
- Direct-fit replacements for all Porsche climate systems.
- Essential for consistent heating, cooling, and fan control.
- Suitable for repairs, restorations, and system upgrades.
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Air con condensers & desiccators
-
Air con evaporators & expansion valves
-
Air con pipes
-
Air con belts
-
Fans & cowlings
-
Compressors
-
Heater flaps
-
Blower Motors & Fans
-
Heater blowers
-
Heater hoses & pipes
-
Vents / Grilles
-
Climate Control
-
Temperature Sensors / Switches
-
Heating / Air conditioning Housings
-
Air Conditioning Retrofit
