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07 trailblazer Heat not always working

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New User

Dec 5, 2014, 10:15 AM

Post #1 of 3 (915 views)
07 trailblazer Heat not always working Sign In

I have an 07 chevy trailblazer and the heat stopped working. I replaced the resistor the other day and it worked great. This morning it was very cold outside and the heat would not work again. I went out lunch time and it wasn't working at first then all of a sudden it came on and worked great. What is making it do this? Thanks

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 5, 2014, 10:36 AM

Post #2 of 3 (907 views)
Re: 07 trailblazer Heat not always working Sign In

You mean the blower doesn't blow air? Try this next time it's definitely down and should be working: Tap on the body of the motor (don't smash it) with a hammer, plastic hammer or hammer with an extension of metal and if it snaps right into working instantly that suggests a high chance that the motor is no good.

Since you did a resistor it sounds like you might do a motor if needed. Just note some or many may use a REVERSE THREADED nut holding the "squirrel" cage on typical types. Check threads on the replacement if unsure that may be available with or without the cage or nut - can't know that for your choice of a replacement but test as much first so it's not just a waste,


New User

Dec 5, 2014, 12:03 PM

Post #3 of 3 (893 views)
Re: 07 trailblazer Heat not always working Sign In

Ok, Thanks Tom

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