Question about 1999 Mercury Grand Marquis

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1997 mercury marquis ac & blower

I was driving in heavy rain with ac & fan on when i suddenly lost ac fan & outside temp . indicator.did i blow a fuse or relay. thanks for the help.

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You could have. Take a look and find out. If the lid/cover of the fusebox does not name the fuses and relay's check owners manual, find the fuse(s) and/or relay and check it out.

Relay can be tested in a few ways,

first, easiest way get a buddy to go in the vehicle and switch your AC on and off, find the relay and get in real close and listen and feel for the relay clicking as he turns it on and off, if the relay is clicking it is most likely working fine.

if you are unsure on relay working you can try this method: theres usually 2 switches one is normally closed one normally open. Using a multimeter and the electrical diagram that should be on the side of the relay itself you should be able to figure out which switch is normally open and which is normally closed. Look carefully sometimes the writing, labels and numbers are hard to see.


Another possible cause is that your temp sensor failed so the computer thinks its -40 degrees and therefor won't run the fan. check the temperature sensor wiring, and the sensor itself after you look at fuses and relay operation.

Hope this helps :)

Posted on May 08, 2009

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