TM 10-3930-659-20 16-13.    INSIDE CAB HEATER HOSES AND HEATER CONTROL VALVE REPLACEMENT (Con't). 6. Install two nipples (1) on cab floor (5). 7. Install  two  hoses  (3  and  4)  on  nipples  (1)  and tighten clamps (2). FOLLOW-ON TASKS: • Fill engine cooling system with antifreeze (see paragraph 5-38). • Close cab fresh air filter door (see TM 10-3930-659-10). TA707006 16-46