No heat

Asked by QueenB2000 Oct 26, 2017 at 09:28 PM about the 2005 Mercury Grand Marquis GS

Question type: Maintenance & Repair

I have a 2005 Mercury Grand Marquis. The
heat won't work. The thermostat has been
replaced. Only cold air is coming through
the vents.

2 Answers
7,355

Brianator answered 6 years ago

Low coolant level, plugged heater core or something is up with the heater valve/linkage

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10

JimTtheguru answered 6 years ago

There is a similar problem with a lot of Ford products of that era. There is an electric motor that controls a vent door. The gears in this vent control switch seem to break, leaving the vent door inoperable. Replace the vent door controller and your problem will be resolved. Hint: If you're hearing a clicking sound coming from an area near the center console where it attaches to the dash when you adjust the temperature, it confirms my diagnosis. Good Luck

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