2003 Mercury Marquis a/c compressor engages when heater is

2003 MERCURY MARQUIS
52,000 MILES • V8 • 2WD • AUTOMATIC
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NBMICH78
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  • 4 POSTS
When I turn on my heat, the a/c compressor/clutch cycles on amd off every 1-2 minutes. I know it should turn on when I use defrost, but it also turns on whenever i use the heat as well and it keeps cycling on and off. Any idea what can be wrong and what I should check?
Oct 12, 2009 at 8:12 PM
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BMRFIXIT
  • CAR REPAIR CONTRIBUTOR
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If you have automatic HVAC system suspect
Automatic temperature control module and its big BIG $$$$$$$
Oct 12, 2009 at 8:34 PM
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NBMICH78
  • MEMBER
  • 4 POSTS
Hi, my hvac is not automatic...its manual.
I dont know if this is related, but I replaced the blower motor resistor and wire harness recently because the fan would only blow when set to high. That solved the issue, but now I noticed the a/c compressor kicks in every time I use the heat...and it keeps cycling on and off every 1-2 minutes. Should I just disconnect the compressor for the winter? I dont want it to fail pre-maturely...or should I check something else?
Thanks
Oct 13, 2009 at 9:30 AM