No AC on my car so I can't say for sure. Not sure when they started using them but AC systems typically have a pressure switch somewhere. If there is no charge in the system, all the freon has leaked out, the pressure switch opens and the compressor won't go on. Keeps the compressor from burning up from running dry. Check the AC plumbing, receiver/dryer, etc to see if there is a switch in it somewhere. Could be a bad switch or low freon level.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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