# Truck Blower?

**URL:** <https://community.cartalk.com/t/truck-blower/71761>\
**Category:** Maintenance/Repairs\
**Created:** [April 4, 2012, 7:06pm UTC](https://community.cartalk.com/t/truck-blower/71761 "2012-04-04T19:06:00Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Red2005](https://avatars.discourse-cdn.com/v4/letter/r/5e9695/32.png) [@Red2005](https://community.cartalk.com/u/Red2005)\
**Post date:** [April 4, 2012, 7:06pm UTC](https://community.cartalk.com/t/truck-blower/71761/1 "2012-04-04T19:06:00Z")

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Hi,

So I have a 2005 GMC Sierra 1500 pickup that is in great condition. Recently, I have noticed that in the mornings on my way to work the blower fan would not run on the highest setting. After a while of driving, the highest setting would then work. This happened for about two weeks. Now, the blower will not turn on at all on any setting. Thought it might a simple fuse, but that looks fine. Should I take it to the shop? Could it be the blower motor that needs to be replaced?

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**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [April 4, 2012, 9:46pm UTC](https://community.cartalk.com/t/truck-blower/71761/2 "2012-04-04T21:46:48Z")

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Sounds like a loose/dirty/corroded connection at the fan to me. Stick your head down under the glove box and look for the fan connector. On some vehicles there might be a trim panel to be removed.

Pull the connector and inspect - both the wiring harness & plug on the fan. Clean it up with some electronics cleaner & plug it all back in. See how that goes.

If you do that and get nothing, with the switch on thump the fan housing with a rubber mallet or block of wood or something. If that gets some life out of the fan then you probably just need to replace it.

After that, I don’t know if you need a shop but you need someone who knows how to use a multimeter to check for power. You’ll be left with a switch problem, some other wiring problem, or still possibly a bad fan motor.

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**Author:** ![oldbodyman](https://avatars.discourse-cdn.com/v4/letter/o/bbce88/32.png) [@oldbodyman](https://community.cartalk.com/u/oldbodyman)\
**Post date:** [April 5, 2012, 5:21am UTC](https://community.cartalk.com/t/truck-blower/71761/3 "2012-04-05T05:21:20Z")

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I would check the resistor. Its in the heater box just to the left of the blower motor I think.

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**Author:** ![Red2005](https://avatars.discourse-cdn.com/v4/letter/r/5e9695/32.png) [@Red2005](https://community.cartalk.com/u/Red2005)\
**Post date:** [April 19, 2012, 10:01pm UTC](https://community.cartalk.com/t/truck-blower/71761/4 "2012-04-19T22:01:31Z")

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I checked the resistor and while doing so found that the wiring harness connection was melted and the resistor fried. Turns out, it is a GMC defect for certain models and years, and the dealer is going to replace free of charge!