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Automatic temp control not working


bcrawfo2

Question

I have a 2004 Yukon Denali with the dual auto climate control.

It blows cold and can switch to heat if I change the temperature enough. The fan control (when not in auto) works, but the temperature control doesn't.

In Auto mode, regardless of how I set the temperature it blows on high, freezing cold. Again, I can lower the fan to slow it down...but the air is still frigid.

I read about the aspirator up above the driver and it sounded like this might be acting up, so I replaced it with no change.

 

Any ideas on what to look at next?

 

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