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Three of the Five fan blowers setting don't work. When I push the A/C button the Envoy won't idle and stalls out.


   
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You have two problems on your GMC.
1. For the blower motors speeds, most likely the blower resistor is burned up and maybe even the connector. See this link for explanation. Blower resistor and wiring
2. For the stalling out when the A/C is turned on, the throttle body is full of carbon and needs to be cleaned out. This is a common problem on the GMC Envoy and the Chevy Trailbazer. Trailblazer stalling


   
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