For some reason, the heater on our 2011 Chevrolet Equinox 2LT (I4 engine) blows cold air when set to defrost mode regardless of the temperature setting. However, the heater works in any other mode. This is happening both at idle and while moving. Is this normal? If not, what might be the issue and how might it be fixed?
The reason this occurs is to take care of the humidity in the vehicle while your defroster is running. MANY older vehicles have this as a common function when your defroster comes on. It's odd though that the temperature setting doesn't change your AC temp. Chevy's 2011's were all CAN BUS computer controlled systems, it might just be a glitchy computer issue.