Cabin Coolant Heater System Operation (Hybrid equipped)
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The cabin coolant heater system provides warm coolant to the heater core to warm the passenger compartment whenever the front DATC (dual automatic temperature control) module requests heat and the vehicle is in a driving mode, remote started, or doing Cabin Drive-Conditioning.
A SOBDMC controlled cabin coolant heater warms the coolant.
The cabin heater coolant diverter valve allows two modes: Either an isolated coolant loop with cabin coolant heater, heater core, and cabin heater coolant pump or a combined loop of those components along with the engine and other coolant components.
A cabin heater coolant temperature sensor in the cabin heater system provides the PCM with coolant temperature information.