TM 9-2320-209-20-3-4 23-13. POWERPLANT COOLANT HEATER HOSES AND CLAMPS REMOVAL AND REPLACEMENT. TOOLS: Flat-tip screwdriver Coolant drain pan SUPPLIES: Engine coolant (as needed) PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Preliminary Procedures. (1) Remove air cleaner filter element. Refer to TM 9-2320-209-10. (2) Open battery box door. Refer to TM 9-2320-209-10. 23-36