[Guest]

while driving & cold at idle. Any one else have or had this problem. Any one know what the fix is?
blend doors have been checked, compressor has been replaced, left door actuator has been replaced, control head has been replaced. GM doesn't seem to know whats causing the problem

 

[77Impala]

Has anyone checked the wiring from the blend door to the control head? Sounds like a wire is messed up. Check the ground wires and then do a continuity check between the connectors at the blend door and the control head. You may need a wiring diagram for this. If you do not have one then I may be able to look one up for you. If you need one please let me know.