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.
Do you
have the same problem?
Yes
No
Saturday, January 15th, 2011 AT 3:08 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
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.
Was this
answer
helpful?
Yes
No
Saturday, January 15th, 2011 AT 4:32 PM
Tiny
BUTTSMT
  • MEMBER
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
Was this
answer
helpful?
Yes
No
Saturday, January 15th, 2011 AT 7:41 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
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.
Was this
answer
helpful?
Yes
No
Sunday, January 16th, 2011 AT 2:14 AM
Tiny
BUTTSMT
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
Sunday, January 16th, 2011 AT 2:26 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
If you have the automatic climate control, you won't have a resister for the front. Chances are you found the problem.
Was this
answer
helpful?
Yes
No
Sunday, January 16th, 2011 AT 4:15 AM

Please login or register to post a reply.

Recommended Guides