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TM 5-4210-220-12
4-19. WINTERIZATION SYSTEM-Continued
4-19.5 Winterization Heater-Continued
e.
Over Heat Fuse Repair
NOTE
This can be replaced without removing unit from
truck.
(1)
Remove knurled nut (3) and protection cap
(1) to gain access to over heat fuse (2).
(2)
Tag and disconnect electrical connections
to overheat fuse.
(3)
Clamp inlet and outlet coolant hoses to stop
coolant flow.
(4)
Remove drain plug (5) and catch coolant in
drain pan.
(5)
Remove overheat fuse (2) and discard.
(6)
Install
new
overheat
fuse,
reconnect
electrical connections as tagged. Replace
protection cap (1).
(7)
Remove installed clamps on coolant hoses.
(8)
Start APU and circulate water through
winterization system topping up radiator as
required.
f.
Overheat Thermostat Repair
NOTE
This can be replaced without removing unit from truck.
(1)
Remove knurled nut (3) and protection cap (1) to gain access to overheat thermostat (2).
(2)
Tag and disconnect electrical connections.
(3)
Remove overheat thermostat (2) and discard. Thermostat is not repairable.
(4)
Install new overheat thermostat.
(5)
Reconnect electrical connections. Be sure they are connected the same as the original unit.
(6)
Replace protection cap (1) and tighten knurled nut (3).
4-304
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