Heating and AC issue

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.

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,747 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

BUTTSMT

MEMBER
11 POSTS

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

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

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

BUTTSMT

MEMBER
11 POSTS

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

JACOBANDNICKOLAS