TM 10-3930-659-20 16-4. HEATER BLOWER AND DEFROSTER BLOWER CONTROLS REPLACEMENT. This Task Covers: a.  Removal b. Installation Initial Setup: Equipment Conditions: Tools/Test Equipment: • Battery disconnect switch in OFF position • General mechanic's tool kit (Item 44, Appendix F) (see TM 10-3930-659-10). • Cab fresh air filter door opened (see TM - References: 10-3930-659-10 • TM 10-3930-659-10 NOTE Heater blower and defroster blower controls are replaced the same way.  Heater blower control Is illustrated. a. REMOVAL 1. Remove connector (6) from switch (5). 2. Remove knob (1), nut (2), switch (5), and washer (4) from heater control panel (3). TA706977 16-14