Expansion Valve on A/C

[Rollin4]

Where is the Expansion Valve on the A/C system located on a 94? I have looked everywhere.

 

[PatentLaw]

Not quite sure on your car. On a 2001 GTS, you have to dismantle the dash and the AC system from the engine compartment to get at it. It is an all day job. Very difficult. Only attempt if you are good with tools and you label everything. Do it right the first time. Getting it back together is very straight forward. Taking it apart is the difficult part.

 

[RAYSIR]

The HVAC housing has to be seperated to get to the evaporator and there are 2 bolts holding it in under dash and 2 from under hood. You need to tag the hoses under dash. Drain or pinch off coolant lines. The expansion valve is attached to the evaporator core. Discharge A/C system 1st.
What are the pressures, high and low with-system on @ 2000rpm, that make you think it's expansion valve? What is the system doing ?

 

[Rollin4]

The HVAC housing has to be seperated to get to the evaporator and there are 2 bolts holding it in under dash and 2 from under hood. You need to tag the hoses under dash. Drain or pinch off coolant lines. The expansion valve is attached to the evaporator core. Discharge A/C system 1st.
What are the pressures, high and low with-system on @ 2000rpm, that make you think it's expansion valve? What is the system doing ?

There is a clog or blockage in the system.The system is not circulating the freon. The compressor and drier are new. All lines have been checked and are not clogged.The condenser has been checked and is not clogged. I can get compressed air circulate thru the evaporator.

 

[RAYSIR]

When you say the system isn't circulating the freon and think it is a plugged expansion valve then the pressures with the compressor running will be the low side in a vacuum and the high side over 300#. If the pressures read the same with the compressor engaged turning the the reed valves in the compressor are bad. Unusual for the condensor or evaporator to plug unless the previous compressor blew. The expansion valve should keep the low side running around 30# by cycling the compressor clutch.