How to Fix my thermostat control on a 1998 Mercury grand Marquis LS it is staying on heat?

Asked by Ratrod69 May 01, 2016 at 06:13 PM about the 1998 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

3 Answers
5,425

Trippmeister answered 8 years ago

Lots of guys on here know more than I do about this. Vacuum hoses, stuck diverter door, controller, lots of different possibilites. One solution involves removing the dash, one can be done through the glove box, with skinned knuckles.

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