Description and Operation - Auxiliary Climate Control - Overview

Overview

The auxiliary electric heater, if equipped, is used to heat the passenger compartment at low ambient temperatures when the heater core cannot provide sufficient heat due to low engine coolant temperature. Once the engine coolant reaches a temperature sufficient to heat the passenger compartment, the climate control system stops using the electric auxiliary heater.

The cabin heater coolant pump is available on vehicles equipped with Auto-Start-Stop function only. The cabin heater coolant pump supplies coolant to the heater core whenever the HVAC system requests heat and the vehicle is in Auto-Start-Stop mode. Refer to the Owner's Literature, Auto-Start-Stop Features section for complete information on enabling/disabling Auto-Start-Stop.