2009 Grand Marquis Ultimate Edition AC compressor stopped worki,

10

Asked by Jun 27, 2014 at 09:15 PM about the 2009 Mercury Grand Marquis LS

Question type: Maintenance & Repair

My AC compressor just stopped working, it was working fine 2 days ago then today it stopped and just blows hot air. I think I checked the correct fuses under the dash and under the hood but the owners manual pics/location layout aren't very clear but I did check anything AC related all fuses are good, I checked visually as well as used a continuity tester.
Does anyone know what else could be the issue?

4 Answers

61,215

Check your freon?

1 out of 1 people think this is helpful.
23,015

Low Freon is most likely the culprit although, I have seen a couple of serpentine belts throw pieces and break the wires at the high pressure cut off switch too.

1 out of 1 people think this is helpful.
1,195

A defective high pressure cut off switch would do it. I think they can be replaced without evacuating the system. Jumping the correct two wires would tell you. The older cars had only 2 wires, but the newer have 4 or more.

1 out of 1 people think this is helpful.
10

It was low on Freon, thanks I'm glad it was simple. It was just strange how it worked great one day then two days later nothing.

1 out of 1 people think this is helpful.

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