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- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
Air Conditioning Expansion Valve
The OE Match air conditioning expansion valve is a
replacement component for the Porsche 911 air conditioning system.
Fits:
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
Diagram ref no 21
This valve regulates the flow of refrigerant entering the evaporator, helping the air conditioning system maintain the correct operating pressure and produce consistently cool air inside the vehicle.
A faulty or restricted expansion valve can significantly reduce cooling efficiency, making replacement an important part of restoring the air conditioning system on a classic Porsche 911.
What Does the Air Conditioning Expansion Valve Do?
The expansion valve controls the amount of high-pressure liquid refrigerant entering the evaporator.
As refrigerant passes through the valve, its pressure drops, allowing it to absorb heat from the cabin air as it travels through the evaporator.
By regulating refrigerant flow, the valve helps maintain efficient cooling and protects the system against incorrect refrigerant distribution.
Why Does It Fail?
Over time, the expansion valve can deteriorate due to age, internal contamination or moisture entering the air conditioning system.
Common causes of failure include:
- Internal blockage from dirt or debris
- Corrosion caused by moisture contamination
- Wear or sticking of internal valve components
- Damage to the temperature-sensing mechanism
- Contamination following compressor failure
When Should It Be Replaced?
A faulty expansion valve may cause:
Poor or inconsistent air conditioning performance Warm air from the ventilation outlets Evaporator icing or abnormal refrigerant pressures Intermittent cooling Incorrect refrigerant flow through the evaporatorReplacement may also be advisable during a major air conditioning overhaul, particularly if the original valve is contaminated or damaged.
These symptoms can have several causes, so the system should be diagnosed before replacing the valve.
Installation & Maintenance Notes
The air conditioning system must be professionally discharged using approved refrigerant recovery equipment before the expansion valve is removed.
Inspect the surrounding pipework, seals and evaporator connections for contamination or damage. Replace disturbed seals as required and use only compatible components and lubricants.
Following installation, the system should be evacuated, leak-tested and recharged with the correct refrigerant quantity.
Porsche 911 Air Conditioning Expansion Valves & Climate Control Parts
The air conditioning expansion valve is an essential component of the Porsche 911 refrigerant circuit, controlling refrigerant flow into the evaporator to provide effective cabin cooling.
On classic Porsche 911 Carrera models, ageing air conditioning components can contribute to poor cooling performance, particularly when valves become restricted or internal seals and control mechanisms deteriorate.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91157392500
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
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
OE Match expansion valve is a replacement for the original Porsche part, designed for Porsche 928, 964 and 993 models. It regulates the flow of refrigerant into the evaporator, ensuring the correct pressure balance for efficient cooling and reliable performance.
Fits:
Porsche 928 1982-95 M570 / M573
Porsche 964 1989-94 M573
Porsche 993 1995-98 M573
* M570 - Cars with air conditioner with improved efficiency
* M573 - Cars with standard air conditioner
Diagram ref no 35
What this product does:
• Controls refrigerant flow between condenser and evaporator
• Maintains stable pressure for consistent cabin cooling
• Prevents evaporator freeze-up and reduces compressor strain
Location: Installed in the A/C system, between the condenser and evaporator
A worn or clogged expansion valve can cause weak cooling, fluctuating cabin temperatures, or excess strain on the compressor. Replacing expansion valve restores proper cooling efficiency, protects the A/C system, and ensures long-lasting comfort in your Porsche.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857312305
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
Air conditioning evaporator by OE Match for Porsche 964 / 993, located within the bulkhead. This component absorbs heat from cabin airflow as refrigerant evaporates.
Fits
- 964 (911) C2 1989–93
- 964 (911) C4 1989–93
- 964 (911) TURBO 3.3L 1991–93
- 964 (911) TURBO 3.6L 1991–93
- 993 (911) C2 1994–97
- 993 (911) C4 1994–97
- 993 (911) C2S 1994–97
- 993 (911) C4S 1994–97
- 993 (911) TURBO 1994–96
- 993 (911) GT2 1994–97
- 993 (911) TURBO S 1994–97
Check fitment for your specific vehicle (model, year, engine) before ordering.
964 — Diagram: 813-05, item 36; Diagram: 813-05, item 37.
993 — Diagram: 813-05, item 34.
What This Product Does
The evaporator is the heat exchanger in the cabin cooling assembly. Refrigerant passing through it takes up heat from the surrounding airflow. The expansion valve controls refrigerant entering the evaporator; it is a separate component and should not be confused with the evaporator itself.
Functions
- Transfers heat from cabin air into the refrigerant circuit.
- Cools air passing through the climate-control assembly.
Technical Details
- Supplied part reference: 96457390100.
- Installation location: inside the bulkhead.
Symptoms of Fault
- Cooling gradually weakens following a refrigerant recharge.
- Vent air remains warm or cabin temperature becomes inconsistent.
- A musty odour develops around the ventilation system.
These symptoms do not establish an evaporator fault on their own. Moisture-related smells may require cleaning rather than replacement, while cooling problems can also originate elsewhere in the refrigerant system.
Why Replacement Matters
A leaking or corrosion-damaged evaporator can allow refrigerant to escape, leaving the air conditioning unable to maintain cabin cooling. Repeated recharging does not repair the underlying leak. Confirming the source before replacing components helps distinguish an evaporator problem from faults involving hoses, the condenser or the expansion valve.
FAQs
- Will a recharge resolve weak cooling?
It may help temporarily, but recurring refrigerant loss calls for leak diagnosis and repair. - Should the expansion valve also be renewed?
Consider its condition while the assembly is accessible. Replacement should follow inspection, rather than assuming both components have failed. - Which supporting parts need attention?
Check seals, O-rings and the receiver-drier when planning the repair. If contamination is suspected, assess whether further system cleaning is necessary.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
96457390100
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
incl. Expansion valve and o-ring seals.
This comprehensive air conditioning (A/C) system service kit bundles key HVAC components required to restore or upgrade the A/C performance in classic Porsche 911 (964 / 993) models. It includes the OE Match evaporator core, blower motors, expansion valve, and genuine O-ring seals necessary for correct installation and leak-free refrigerant performance.
Fits:
Porsche 964 1989 - 1994
Porsche 993 1994 - 1998
Diagram Ref No 5, 34, 35, 37 and 38.
This A/C service set is a combination of essential climate control components engineered to ensure your Porsche’s air conditioning system delivers reliable, cold airflow and maintains proper refrigerant flow throughout the system. The kit is ideal for A/C system rebuilds, evaporator replacement jobs, or when multiple HVAC components show wear due to age, moisture exposure, or refrigerant system fatigue.
Kit Includes:
• OE Match A/C Evaporator – OE ref no 96457390100
• OE Match A/C Blower Motor – OE ref no 96457201501
• OE Match A/C Blower Motor – OE ref no 96457201601
• OE Match A/C Expansion Valve – OE ref no 92857312305
• O-Ring Seals – OE ref no 99970743441 and 99970725141
This kit is intended for use within the air conditioning system - specifically the evaporator chamber, refrigerant metering, and blower airflow portions of the HVAC assembly.
The A/C evaporator (Part No. 96457390100) cools the cabin air by absorbing heat from incoming air passing through the HVAC system into the A/C refrigerant circuit. As refrigerant enters the evaporator, it expands and removes heat - providing cold, conditioned air for the cabin.
The blower motors (96457201501 & 96457201601) circulate air across the evaporator core and into the cabin through the ventilation ducts. Reliable blower operation is essential for efficient A/C performance and passenger comfort.
The expansion valve (92857312305) precisely meters refrigerant flow into the evaporator, ensuring the correct pressure and temperature for optimal cooling. An effective expansion valve prevents evaporator freeze-up and reduces strain on the A/C compressor.
High-quality O-ring seals (99970743441 and 99970725141) guarantee leak-free connections between A/C components, maintaining proper refrigerant pressure and system integrity.
Over time, A/C evaporators can develop internal corrosion, refrigerant leaks, or blockages. Age-worn blower motors fail to deliver sufficient airflow, and expansion valves can become clogged or lose metering precision. Faulty O-rings degrade and allow refrigerant to escape. This leads to:
• Weak cabin cooling
• Unstable A/C pressure
• Blower noise or failure
• Higher compressor load
• Reduced HVAC efficiency
Replacing these components with OE Match quality parts and genuine Porsche O-rings ensures correct fit, proper refrigerant sealing, and long-lasting air-conditioning performance.
Recommended replacements if you notice:
• Diminished cooling capacity or warm air from vents
• Weak or inconsistent blower airflow
• Refrigerant leaks or low system pressure
• Excessive blower noise
• System not reaching cold set temperature
• During A/C system overhaul or major service
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
AIRCONKIT18.1
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- 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
incl. Expansion valve and o-ring seals.
This complete air conditioning (A/C) service kit is a comprehensive set of HVAC parts engineered to refresh or restore the climate control system on your Porsche 993. It combines key components - the OE Match evaporator core, A/C blower motors, pollen (cabin) filter, expansion valve, and essential O-ring seals - giving you everything needed for professional-grade A/C performance and leak-free refrigerant flow.
Fits:
Porsche 993 1994 - 1998
Diagram Ref No 5, 7, 34, 35, 37 and 38.
This set brings together core HVAC elements required for an efficient and reliable air conditioning system. At the centre is the OE Match A/C evaporator , the heat-exchange core that cools incoming air by removing heat from the refrigerant before it enters the cabin. Complementing it are two OE Match A/C blower motors that push air through the system, and a high-quality pollen filter that traps dust, pollen, and other airborne particles for cleaner cabin air.
The kit also includes the A/C expansion valve - a critical refrigerant metering device - along with appropriate O-ring seals to ensure tight, leak-free connections throughout the refrigerant circuit.
Kit Includes:
• OE Match A/C Evaporator – OE ref no 96457390100
• OE Match A/C Blower Motors – OE ref no 96457201501 and 96457201601
• OE Match Pollen (Cabin) Filters – OE ref no 96457201601
• OE Match A/C Expansion Valve – OE ref no 92857312305
• O-Ring Seals – OE ref no 99970743441 and 99970725141
Function
The A/C evaporator (96457390100) cools cabin airflow by absorbing heat from the incoming air via refrigerant circulation, delivering cold, comfortable air inside the vehicle.
The blower motors (96457201501 & 96457201601) generate and control airflow through the ducts and across the evaporator, ensuring you feel cool air at the vents when the A/C system is on.
The pollen (cabin) filter (99357247900) helps clean the air drawn into the cabin by removing contaminants and allergens, improving air quality and passenger comfort.
The expansion valve (92857312305) precisely meters refrigerant entering the evaporator, controlling pressure and cooling efficiency. Without proper metering, the A/C system can under-cool or freeze up.
The O-ring seals (99970743441 & 99970725141) ensure all refrigerant joints are sealed tightly, preventing loss of refrigerant and maintaining system pressure for effective cooling.
Air conditioning components degrade over time due to heat cycling, moisture exposure, and refrigerant pressure changes. A worn or failing evaporator can leak refrigerant or lose cooling capacity. Existing blower motors may weaken or fail completely, reducing airflow and cabin comfort. A clogged pollen filter restricts airflow and can circulate dust and allergens inside the cabin. Faulty expansion valves cause inefficient cooling or frost build-up, while old or hardened O-rings lead to refrigerant leaks, hurting system pressure and cooling performance.
Replacing these with quality OE Match parts and genuine seals ensures correct fit and restores the cooling system to its intended performance - keeping your cabin cool, comfortable, and leak-free all season long.
Recommend replacement if you observe:
• A/C blowing warm air or weak airflow
• Reduced or inconsistent cooling performance
• Unusual blower noise or motor failure
• Noticeable dust or odours from vents
• Moisture or leaks in evaporator area
• Difficulty maintaining A/C set temperature
• As part of a full A/C system service
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
AIRCONKIT18.2
The product you are viewing cross references to these numbers
This kit is comprised of the following items: