Ac temp control not automatic anymore

Richard Blakely · Sep 17, 2019

i have temperature control where you set a temp and not have to do anything else. However it is not automatic anymore. You have to manually turn fan blower up or down and max button always stays on and has to be pushed. If in auto mode, all of this should be automatic, but is not.

Doubeleive · Sep 17, 2019

Richard Blakely said:
i have temperature control where you set a temp and not have to do anything else. However it is not automatic anymore. You have to manually turn fan blower up or down and max button always stays on and has to be pushed. If in auto mode, all of this should be automatic, but is not.

what year make model? could be a bad blower motor resistor, could be the main control, the resistor is more likely though.

Richard Blakely · Sep 17, 2019

Doubeleive said:
what year make model? could be a bad blower motor resistor, could be the main control, the resistor is more likely though.

Where is blower resister located? I have both a 2007 and 2012 tahoe

Richard Blakely · Sep 17, 2019

Richard Blakely said:
Where is blower resister located? I have both a 2007 and 2012 tahoe

Both are doing the same thing

swathdiver · Sep 17, 2019

Richard Blakely said:
Where is blower resister located? I have both a 2007 and 2012 tahoe

Under the dash in the passenger footwell, behind that black cover that goes above one's feet.

With two trucks in the stable, you're a good candidate for a Tech-2. If something is wrong, there are codes stored internally that will tell what's wrong and why.

Doubeleive · Sep 17, 2019

blower motor resistor is under the kick panel under the passenger side glove box on both trucks, once you have the panel off you will see it near the blower motor.
but just something to note if the automatic temp is set higher than the outside ambient temperature it probably wont come on until you take it off automatic.

also what "max" button?

Doubeleive · Sep 17, 2019

another thing it could be also is the environmental sensor which is above the drivers head in the headliner, it looks like a microphone or small speaker and there may be two of them one of them being a Bose mic if you have the Bose system, (the grills looks identical) but the other one will be a small squarish grey module with a fan it, if the fan stops spinning it wont read the temperature correctly, a new one runs about $20-25 online easy to replace by just pulling the headliner down from the drivers side door area.

Richard Blakely · Sep 17, 2019

Richard Blakely said:
Where is blower resister located? I have both a 2007 and 2012 tahoe

Maybe I wasn’t clear. The blower works in manual mode. It just doesn’t cycle automatically, nor does the outside air button

Richard Blakely · Sep 18, 2019

Doubeleive said:
blower motor resistor is under the kick panel under the passenger side glove box on both trucks, once you have the panel off you will see it near the blower motor.
but just something to note if the automatic temp is set higher than the outside ambient temperature it probably wont come on until you take it off automatic.

also what "max" button?

The “max” button I mentioned is the button with a car graphic with a sideways “U” in the middle. Pic below

Doubeleive · Sep 18, 2019

Richard Blakely said:
The “max” button I mentioned is the button with a car graphic with a sideways “U” in the middle. Pic below

View attachment 230925

that's the re-circulation button

Ac temp control not automatic anymore

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