Fuel Fired Booster Heater (FFBH) Changeover Valve (Vehicles With Timed Climate Control Only)
WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
On vehicles with timed climate control, the Fuel Fired Booster Heater (FFBH) changeover valve is attached to a bracket on the FFBH. The FFBH changeover valve is a normally open solenoid valve installed between the supply and return sides of the heater coolant circuit. When de-energized, the changeover valve connects the heater coolant circuit to the engine coolant circuit. When energized, the changeover valve isolates the heater coolant circuit from the engine coolant circuit.
Operation of the changeover valve is controlled by a power feed from the HVAC Control Module.