TM 9-2320-209-20-3-4 c. Repair. Repair parts in their place. d. Replacement. FRAME 1 is limited to throwing out damaged parts and getting new 1. Working in engine compartment, put two duct clamps (1) on 3 1/2-inch heater duct (2). Put heater duct in place and slide duct clamps to each end of duct as shown. Using screwdriver, tighten two duct clamps. 2. Working from inside of cab, put two duct clamps (3) on 19 1/2-inch diverter duct (4). Put diverter duct in place and slide duct clamps to each end of duct as shown. 3. Using screwdriver, tighten two duct clamps (3). GO TO FRAME 2 23-5