Heating and AC issue

Tiny
BUTTSMT
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • V8
  • 4WD
  • AUTOMATIC
  • 188,000 MILES
2003 Tahoe V8 5.3L Flex
- My heat will only work on the highest setting when it does decide to work. It will run sometimes, but others I can't get it to cut on. The circulation light will just blink 3 times and go off. I am thinking of starting with the blower motor resistor, but I wasn't sure. Any suggestions? Also the blower will still run when the vehicle is off. Thank you.
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Saturday, January 15th, 2011 AT 3:08 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,005 POSTS
The blower motor resister sounds like the best place to start. When they go bad, they are designed to still function in the high setting as a default. You are on the right track. Keep in mind, when the resister goes bad, it is often caused by a blower motor that is drawing too many amps. If you replace the resister and it happens again, check the amperage draw from the blower motor.
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Saturday, January 15th, 2011 AT 4:32 PM
Tiny
BUTTSMT
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Great thanks. Any chance you have any pictures of how to replace this? I can't seem to get a good orientation on what I am looking at. Instructions are just as good. Thanks for the help
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Saturday, January 15th, 2011 AT 7:41 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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The blower motor resister is usually located in the HVAC box near the blower motor itself. Yours is under the dash on the passanger side (up high). I couldn't find an exact picture of your vehicle, but was able to find a general picture of how the system works and its components. If you look to the left of the motor, you will see the resister. Yours should be very similar.

I hope this helps.
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Sunday, January 16th, 2011 AT 2:14 AM
Tiny
BUTTSMT
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I appreciate the attempt. However my vehicle doesn't appear to have a "resistor". It has a "blower motor module". Passenger side, I removed the plastic covering, and there is what appears to be the bottom of a fan. Passenger side, almost by the door but under the dash. Right next to it is a rectangular box with a purple wire and black wire connecting it to the blower motor. It is a 12v box. It has a connector port with A, B, C, connections. It is ac delco part #15-80567. I can't figure if I am supposed to have a resistor along with this part that I have or if this is all I have. My car has automatic climate control, front and rear. It is pretty confusing. I will try replacing the module and see what happens.
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Sunday, January 16th, 2011 AT 2:26 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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If you have the automatic climate control, you won't have a resister for the front. Chances are you found the problem.
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Sunday, January 16th, 2011 AT 4:15 AM

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