Glad you found it. 1977 Firebirds used an evaporator temp switch to control clutch cycling, so I didn't know if the GP did too. By 1979 for sure I've seen pressure cycling setups only.
Pressure cycling switch on the accumulator became the standard for decades after that. I love the simple orifice tube systems.
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"...ridge reamer and ring compressor? Do they have tools like that?"
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