location of temperature sending unit/fan switch 2010 mercury grand marquis ls

Asked by Monir Jul 10, 2018 at 06:40 AM about the Mercury Grand Marquis

Question type: Maintenance & Repair

My  2010 mercury grand marquis heats up when there is a traffic jam provided
the AC is on and does not if I am driving on the highway or the AC is not
running.

1 Answer
30

Aviatorbill9 answered 5 years ago

My 2009 Grand Marquis does the same thing. I replace the coolant fan module, temperature coolant sensor, and then got desperate and replaced the emc. The input to the fan module has +/- 12V but the control wire doesn’t have a signal input to it from the ecu.

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