Question about 2003 Chevrolet TrailBlazer

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03'Chevy TrailBlazer..rear ac don't work, rattling under truck

My AC was only blowing on #3 setting and I took it back to the dealer, they changed the resistor and now it blows on all the settings. The rear a/c is not working at all. The dealer said I have to bring it back up to them (cuz I had to have the truck back that day) that they had to figure out why the back isn't blowing. Any ideas what that problem can be? Also, there is a bad rattling under the truck, under my feet. I was thinking maybe the muffler was loose but the dealer said no. What could be loose and rattling under the truck around the area where my feet is?

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  • Anonymous May 14, 2010

    Why are you wasting money at the dealer , on a 7 year old vehicle ,vs. going to a local repair shop?

  • melindasnead May 14, 2010

    Because I have a warranty that I paid for so I'm not wasting any money, just time. It's taken care of now. Thanks

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  • Chevrolet Master
  • 1,111 Answers

When the dealer replaced your resistor, they probably unhooked the battery (naturally for safety). However, this can blow the actuators unfortunately, especially if it was set to on when they unhooked and rehooked the battery back up. Pretty common problem. The rattling very well could be your stabilizer bar end links. Grab a hold and try to wiggle, should be no movement. Pretty common for these to go out also. When replacing these, get new ones that are greasable with zirks. OEM's are not serviceable.

Posted on Apr 27, 2017

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Posted on Jan 02, 2017

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SOURCE: 03 Trailblazer won't shift into 4WD

go to auto zone to pull transfer case code for no charge to costly to guess

Posted on Sep 01, 2009

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SOURCE: 03 Trailblazer Blower Resistor connector different

the resistor you bought is for manual heating, your three wire is more a module then a resistor. you need the module for the automatic heating system, automatic heating has a digital display and manual has sliders.

Posted on Oct 07, 2009

  • 7353 Answers

SOURCE: 2003 Chevy TrailBlazer..bad rattling under truck and feet.

It could be a bad rear blower motor, or resistor? theres a lot under the truck that could make noise, have a repair shop check it and make repairs.

Posted on May 14, 2010

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  • 14 Answers

SOURCE: I just replaced the compressor

probably low on freon

Posted on Aug 11, 2011

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2003 Chevy TrailBlazer..bad rattling under truck and feet.


It could be a bad rear blower motor, or resistor? theres a lot under the truck that could make noise, have a repair shop check it and make repairs.

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