Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Make sure when you are viewing failure codes for this system you are viewing BCM(body control module) & not PCM(powertrain control module).Most of the time when this problem occurs it is the temperature control actuator,which you can view input & output controls from BCM data list.Here is some help replacing it.
Temperature Valve Actuator Replacement
Tighten Tighten the screws to 1.5 N·m (13 lb in).