1995 Mercury Marquis

Tiny
MADDOG27
  • MEMBER
  • 1995 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I have a 1995 Mercury Grand Marquis and when I turn on the a/c to max, I get heat blowing out instead of cold air. I can clamp off my inlet hose for the heater core and get cold air but I want to fix the problem and not bandage it. What is the cause of this?
Sunday, June 8th, 2008 AT 7:33 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Run the self diagnostic test on it by turning the key to on, then press off and floor at the same time, then within 2 secs, press auto, If there is a problem a trouble code will appear on the display. To exit self test, press the BLUE, cooler button this also retains error codes, To erase code and exit, press defrost, choose one of these before you power down the system. Test with engine at 120 degrees or more, and cabine between 40-90 degrees. Post any codes recorded here and I let you know what's defective.
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Sunday, June 8th, 2008 AT 7:36 AM

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