2005 Chevy Trailblazer NO VENTS WORKING

Asked by ccowan89 Oct 29, 2019 at 11:23 AM about the 2005 Chevrolet Trailblazer LS 4WD

Question type: Maintenance & Repair

I have a 2005 Chevy Trailblazer. This past summer when it was VERY hot
out, the AC smelt like it was burning so i stopped using it. But the next day it
was fine. I have since changed the air filter and oil change. (idk if that has
anything to do with this). Yesterday when i woke up to start my car before
work (it is currently 15 degrees outside) the heater or defrost wouldnt work. I
tried even turning the AC on to see if it was just the heater but it is the entire
blowing unit. I dont know why it just suddenly stopped working, im assuming
because of the cold? how can i fix this?

2 Answers

11,655

If the entire blower isn't running, likely you have a blown blower motor resistor or blower motor control module. There's a difference between the two, the resistor is for manual controls, the module is for digital. Both look the same and in the same location, but function differently. When you replace it, replacing the pigtails that go to it is a must. These tend to melt.

Thank you FJ4072, question, is this located under the glove box area? My heat and ac controls are all manual, nothing digital so I’m assuming I’ll need to get the blower motor resistor.

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