why does my heater only work on defrost on 2005 Grand Marquis,AC works the same way

Asked by tralee16 Jan 30, 2016 at 08:27 AM about the 2005 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

My climate control only works on defrost when blowing hot or cold. Would
removing the face control and cleaning contacts help?

3 Answers

25

I had the same problem on my 1998 grand marquis. I had to replace my climate control.

2 people found this helpful.
140

Temperature control modulator. YouTube how to bypass it. Super easy

Have a 2003 Merc Marq. LS with climate control. Same problem. Dealer told me new module, for $600 plus install. Researched and found out the design was bad because of a weak chip inside module which controls air flow, etc.It fries when interior gets too hot. Bought a used module for $100 and put it in myself. Worked fine for 3 months. It fried, same symptoms. Found a company in Van Nuys, California replaces chip and remans the module the way it should have been built. That was 5 years ago and haven't had a problem since. Company is Module Repair Pro. 5 stars in my book.

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