why does my air condition keep blowing heat when i turn it on air condition


Asked by Mar 07, 2015 at 08:56 PM about the 1997 Mercury Grand Marquis 4 Dr LS Sedan

Question type: 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

2 Answers


The most likely problem is a heater door failure, if you have an HVAC system it could be a failed servo motor failure, if you don't it could be a vacuum problem with the mode switching.

Giulio Moro

Older vehicles used manual cables to open and close the doors, so I'd look in that area if you have manual controls, otherwise look into what is controlling the door to divert the incoming air supply source properly.

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