Heating and AC issue

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.

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

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.

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.

If you have the automatic climate control, you won't have a resister for the front. Chances are you found the problem.