Air conditioning expansion valve. Porsche 911 1984-89  ›  91157392500

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)  

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:

Replacement 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.