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When the air temp output is only correct on one side, this is more commonly due to a faulty Air Temp Actuator. This is a little motor that turns the door internal of the HVAC housing to switch between heat and A/C. The driver's side actuator is located behind the center/driver's side of the dash. To gain access, remove the steering column opening trim. The actuator is above and to the right of the accelerator pedal. Inspect the electrical connector and wire harness for any loose, broken or damaged wires. Remove the actuator and try to turn the door by hand. The temp output should now be correct. If not, the problem lies internal of the HVAC housing. If the checks are ok, replace the Actuator. These are actually very common fail items on GM vehicles. Please remember to leave a rating using the 'stars' or click 'Accept'. A 5-star rating is much appreciated! Rating or accepting my answer does not cost you extra.
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