TM 9-2320-209-20-3-4 c. Replacement. FRAME 1 1. Put heater assembly (1) in place on heater support (2) and line up holes. 2. Using wrenches, screw in and tighten four screws (3) and lockwashers and nuts (4). 3. Join two ends of heater motor cable (5) and plug together connector (6). 4. Put ram air duct (7) and heater outlet duct (8) onto heater assembly (1). Using screwdriver, screw in and tighten two screws in two clamps (9). NOTE Follow-on Maintenance Action Required: 1. Replace two heater hoses. Refer to para 23-18. 2. Close hood. Refer to TM 9-2320-209-10. END OF TASK 23-3