will not switch from heat to ac

Asked by Sep 15, 2014 at 03:14 PM about the 2002 Mercury Grand Marquis GS

Question type: Maintenance & Repair

blower works find will not switch from heat to AC

1 Answer
1,375

answered 3 years ago

Does the compressor clutch engage? Most likely, you have a leak and are out of refrigerant. Possibly a bad pressure cut off switch.(easily visible with 2 wires plugged into it. The controls on a GS are a lot simpler than the LS, but I doubt if that's it.

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