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1994 Cadillac Fleetwood Brougham (some show and some go!)
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My 94 FW climate system still baffles me sometimes..... the compressor comes on for certain settings, even heat, to pull the moisture out of the air (I presume) and condition the air. I think that's what you are experiencing.

But what you may be further experiencing is low refridgerant in the ac system, causing weird pressures and the compressor to cycle, doesn't matter if you're in heat or cool, the compressor is still "called on" anyway. It's cycling due to low juice or a bad AC system component/sensor that deals with pressure.

I had low refridgerant when I got my 94 FW and added a bit and the cycling went away.

Good luck
 
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