AC Dilema!
I have an '89 Supra. We have replaced the expansion valve, flushed the lines replaced all o rings. The inital problem was the compressor was constantly kicking in and out at close to one second intervals. One second, one off. We jumper wired the plug for the low/high pressure sensor which keeps the compressor running. Lines outside the vehicle are cold and frost developes. No cold air inside. I'm thinking a door in the duct work is not working properly, anybody?
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