Thermostat failed.EMC had to be reprogrammed. I had to dispute $110.00 "Diagnostic" charge to GM/Chevy customer service to get waived for something I later found out should have been covered under longer warranty plan.
water pump leaked, replaced
Ever since recall for thermostat and water pump was replaced under warranty in the warmer months the fan would turn off and on in rapid succession. When I may mention of this to dealer service told it was normal
Water pump was leaking coolant. Water pump was replaced
Noticed some fume type smells from AC vents sometimes when coming to a stop.
Leaking thermostat housing, repair delayed due to lack of gasket for thermostat housing.
Water pump seal failure caused coolant loss
Engine blown. Known problem with head repaired under warranty