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2003 gmc envoy_slt
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357 Posts
Your Owners Manual on page 3-24 explains what the Mode button does and it is located just below the Auto button on the Auto A/C models. And, yes, pushing the Defrost, Rear Defrost, and Mode buttons at the same time will reset the ambient temperature sensor.

C.B.
 

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Registered
2003 gmc envoy_slt
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357 Posts
Yes. Try again and a third time if necessary. If it won't reset with engine off, try it with engine on. If it just won't reset, replace the temperature sensor which is cheap and easy. Do a search on ambient temperature sensor for instructions and pictures.

C.B.
 
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