1990 Mercury Grand Marquis GS mileage: 91,000. When the air conditioner is on and the car is running at 60 MPH, the air-conditioner blows very cold. In traffic with stop and go it starts blowing hot. I have replaced compressor, clutch, dryer, condenser and also installed inline filter. When in traffic, temperature gauge climbs and then the air conditioner will blow hot. Is there a limitor switch or something that cuts the air conditioner out when the temperature gauge gets to a certain point? Any ides of how I can fix the problem. I live in Arizona and it's very hot here.
Friday, November 19th, 2010 AT 7:53 PM