# '03 Trailblazer blower fan **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, blower-motors, heating, trailblazer, airconditioning, fans\ **Created:** [November 21, 2009, 4:18pm UTC](https://community.cartalk.com/t/03-trailblazer-blower-fan/39807 "2009-11-21T16:18:34Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![patsh1](https://avatars.discourse-cdn.com/v4/letter/p/9de053/32.png) [@patsh1](https://community.cartalk.com/u/patsh1)\ **Post date:** [November 21, 2009, 4:18pm UTC](https://community.cartalk.com/t/03-trailblazer-blower-fan/39807/1 "2009-11-21T16:18:34Z")
I have an '03 Chev Trailblazer, and the blower fan only works on the high setting. For a while it would come on after the engine has had time to warm up, but now it doesn’t work at any lower speeds. What I need to know is where to find the temperature sensor and speed resistor pack that control the slower speeds. I don’t like running it at high speed all the time since it gets a little too loud, and I have to turn up the radio to hear it. With winter coming I am going to need to run it almost constantly. ---
**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\ **Post date:** [November 21, 2009, 4:20pm UTC](https://community.cartalk.com/t/03-trailblazer-blower-fan/39807/2 "2009-11-21T16:20:40Z")
The resistor pack is usually located in the ductwork very close to the blower motor. ---
**Author:** ![patsh1](https://avatars.discourse-cdn.com/v4/letter/p/9de053/32.png) [@patsh1](https://community.cartalk.com/u/patsh1)\ **Post date:** [November 21, 2009, 4:31pm UTC](https://community.cartalk.com/t/03-trailblazer-blower-fan/39807/3 "2009-11-21T16:31:09Z")
Is that under the cover right behind the hood, and inside the ductwork itself? I’m guessing that is to keep it cool.