My 92 RS used to have perfect AC which I never used because I liked the windows rolled down on the highway. Then one day I was driving through Miami and it was hot as ***** outside so I flipped the AC on to cool down. It just blew hot air at me. I took it to a hole-in-the-wall shop to see how much they would charge me to fix that, and they quoted $300+, so I just left. A couple of months later my friend's dad converted my freon to whatever the new standard is and recharged the thing. It blew ice cold for a while, but then it became nice and warm again. If it's morning and I just start the car, the AC will blow cold until I turn it off. If I turn it off, it does not kick in until the car sits for 4 or 5 hours. Also, if I accidentally turn it off while driving, turn it back on, press the clutch and rev the engine to 4500 a couple times, it will usually turn on.

Not really a major issue because 95% of the time I drive on the highway, but still I'd like to know what's going on. Ideas anyone?

Thanks in advance ...

 

Make sure the low pressure cycling switch is connected and the switch contacts are closed. system pressure readings at a listed ambient temperature would be really helpful in the diagnosis.