Fan speed switch will not function

Tiny
BOBANDD
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 70,000 MILES
The fan speed switch will not function on level 1 and 2. Level 3 / 4 / 5 work well. Is the switch bad? Or is the capacitor on the fan bad? How do I change?
Friday, February 6th, 2015 AT 7:15 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

It sounds like the issue is with the blower motor resistor.
When you change the fan speed the resistor is what controls it.
Many times the resistor will malfunction, and you will only have certain speed.

The blower motor resistor is located in the blower motor housing. You will have access it from under the dash on the passenger side.

Here is a helpful video:

https://youtu.be/Be61A67ltP4

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.
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Sunday, October 17th, 2021 AT 7:57 PM

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