TM 9-2320-209-10-1 e. Operating the Fuel Burning Power Plant Heater. FRAME 1 NOTE The fuel burning power plant heater is designed to keep the engine compartment warm when vehicle is not in use. This heater should not be used while operating the vehicle. 1. Make sure heater coolant outlet shutoff cock (1) is fully open (turn left). 2. Make sure heater coolant inlet shutoff cock (2) is fully open (turn left). GO TO FRAME 2 4-391