Mechanics

04 - FAN WON'T SHUT OFF

2004 Chevrolet Trailblazer • 6 cylinder 4WD Automatic • 181,000 miles

The AC/Heater fan won't shut off after vehicle is shut off, 2004 chevy trailblazer, any ideas on what is wrong? We had to disconnect the battery to get the fan to stop running.
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Loridemann
July 30, 2011.




Check and test the blower motor relay

Tiny
Rasmataz
Jul 30, 2011.
Where is this located and how do you test it? Please advise, my husband is out looking at it right now and he's no mechanic, but has replaced a few minor things on the truck, is this something major or could a novice do it?

Tiny
Loridemann
Jul 30, 2011.
The power module is in the under hood a/c case. This needs to be replaced

Cadieman
Jul 30, 2011.
Hi! You mean the power module needs to be replaced or the blower motor relay? (See previous post by rasmataz) Please advise and thank-you!

Tiny
Loridemann
Jul 30, 2011.
If you disconnect the power module the fan will stop.U need a power module.I see them on line for 75 dollars.
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Cadieman
Jul 30, 2011.
Hi! We just came from O'Reillys Auto parts and they said it is the Blower Motor Resistor in which we had replaced about 5 years ago and it is bad again, it seems. Can you tell me how to get info on replacing it? My husband will do it, watched the other mechanic do it the first time but can't remember how he got to the part to replace it? Ie. Through the dash, but is it the glove box area or driver's side. How do you get to the part?

Tiny
Loridemann
Jul 30, 2011.
Blower Motor Resistor Assembly Below right side of dash, near blower motor-sorry no picture

Tiny
Rasmataz
Jul 30, 2011.
Thanks guys, it's done and it works. Any ideas of why we go through these so often though? Replaced very same part less than 3 years ago and this part was heat damaged. You could smell the burnt smell on the actual old part after we removed it. Man, you guys are awesome!

Tiny
Loridemann
Jul 30, 2011.
You're welcome, Its probably due to an overload or just not made right

Tiny
Rasmataz
Jul 30, 2011.

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