Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Try and recalibrate the actuators.To do this if you have the manual heat and ac controls remove the heater and ac fuses from the interior and under hood fuse panels for 5 minutes and allow the vehicle to sit.Then reinsert the fuses and turn on the key without starting the engine or touching any heater or ac controls.Then after 1 minutes start the vehicle and see if the heater and ac controls operate properly then.If you have the auto temp controls with the auto features this recalibration has to be done with a scan tool that will plug in and communicate with the heater and ac system.
If this was already attempted let me know.
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If you only have one vent blowing properly and the rest barely blow out anything this sounds like a possible restriction or damaged component in the heater box itself needing removed and inspected for repair or replaced.
If this was a mode actuator or the control unit at fault all vents would be affected and since it is involving all but one vent this sounds like a mechanical fault or restriction in the heater box itself.
The heater box components will need to be inspected to locate and repair the fault here.