Fuel Operated Heater (FOH) Van Models Only

If your vehicle includes a fuel operated heater (FOH), it will enhance heater performance and will reduce the amount of time it takes to warm the inside of your vehicle in cold conditions below 40°F (4.4°C). The fuel operated heater is installed in the frame rail on the driver's side of the vehicle and uses diesel to warm up the engine coolant, which finally warms up the passenger's cabin air. The FOH works automatically, depending on the fuel level, engine coolant temperature and outside air temperature. It works only with the engine running.