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Discussion Starter #1
I've got a 93 500sel. It does NOT have rear AC/heater controls, just the lever to open and close the vents. Recently I've noticed that the AC compressor runs all the time and the back seat vents blow cold air, no matter what I have the front climate control set to. I can set it to full heat and the back seat will still be getting air conditioning.

Can someone please explain how this should be operating and what the problem might be (if there is one)? This has happened with the outside temp anywhere from 60-95 deg F.

Thank you!
 
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