Check obvious stuff, like no or low refrigerant, and fuses. Same problem on my 1991 was the Temperature Blend Actuator, This controls the door in the plenum which in turn controls which is sent thru to the cabin.. A/c or Heat.Unfortunately requires a partial removal of the Dash ( Instrument panel.) Complicated even more with a passenger airbag.
1999 Mercury Grand Marquis 4 Dr GS Sedan
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Maintenance & Repair
When the A/C is on and blowing cold air, it suddenly changes to blowing warm air. It is full of freon.
2001 Mercury Grand Marquis
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Maintenance & Repair
After a couple of days of a knocking noise around the on off switches. Which I was able to stop by turning the heater / air to off and presses all the buttons, I did not have cold air anymore. It j...
2003 Mercury Grand Marquis LSE
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Maintenance & Repair
the air condition keep blow heat even when i turn in on air condition. the compresser is turning, and the lines are cold but the air want come out cold
1997 Mercury Grand Marquis 4 Dr LS Sedan
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Maintenance & Repair
STALLS OUT AT STOP LITE ONCE IN AWHILE BUT RUNS GREAT AND THE TRAC LITE COMES ON WHEN IT HAPPENS FUEL PUMP WAS REPLACE EARIER
2002 Mercury Grand Marquis LS Premium
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Maintenance & Repair
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