Why wont the radiator fan run on my 2006 Mercury Grand Marquis

Asked by Jul 13, 2014 at 03:20 PM about the 2006 Mercury Grand Marquis LS Ultimate

Question type: Maintenance & Repair

I have changed the thermostat and the cylinder temperature sensor and the car still runs
hot and the radiator fan does not come on. What should I check next?

6 Answers


Check the relay(s). They'll be in the under hood fuse box. I have an '08 Grand Marquis and the fans come on whenever I put on the A/C. HTH. -Jim

5 people found this helpful.

could be the coolant sensor

4 people found this helpful.

Relay is the most likely, some auto stores will check them for you.

1 people found this helpful.

hello there, can you advise me what was the root of the problem , i am having the same exact issues with my 2006 LS grand marquis. any help is appreciated. thank you

6 people found this helpful.

what is the probable cause for the radiator fan to stop causing overheating


the cooling fan is variable speed controlled by a module attached to the fan and controlled by the computer. if you chk the wiring diagram you will find 1 wire(heavy) is +12v one (heavy) is gnd and the third is a small control wire which carries a signal from the ECM. the other side of this module goes to the fan. if you unplug and "hot wire" the fan and it runs and the input wires (hot and grnd) are ok most likely a bad modual

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