Overview (Diesel 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.
An electric booster heater is available as optional equipment on diesel vehicles. The climate control system uses the electric booster heater, also known as the PTC heater, to heat the passenger compartment in place of the heater core in low ambient temperatures. Once engine coolant reaches a sufficient temperature and can maintain it to heat the passenger compartment, the climate control system stops using the electric booster heater.