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Re: 95 Firebird a/c battle(question)
Some systems used a high-pressure cutout switch built into the rear of the compressor.
Some systems used an refrigerant pressure sensor (red-black/black/gray wires) in addition to cutout switches.
Some systems used an evaporator temperature sensor (dark blue/black/gray wires).
A pressure switch after the expansion valve/orifice would be the low pressure switch.
What are the system pressures with the A/C compressor shut off?
What is the engine coolant temperature? A high CTS input can prevent the PCM from turning on the A/C compressor.
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