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Re: I have a climate control problem on 2004 gmc envoy,...
The likely problem is the blower motor resistor pack is defective. It is located behind an access panel below the glovebox. Go to www.trailvoy.com and do a search on "blower motor resistor replacement"
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If equipped with climate control, the most likely cause of this issue is a blend door motor failure. IN some cases the entire dash assembly must be removed to access these control motors.
The switch needs to be replaced or cleaned, there r 4 copper connections that regulate the power going to the motor, the previous owners probly only used hi so the connections r dirty
Climate control need to be reset, turn all functions off and set all switches to CCW position. Disconnect battery for about 10 minutes, reconnect battery and don't touch any controls for several minutes. You may hear the climate control cycling at this time.
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