TM 5-3810-307-24-1-2
e.
Slide grommet (16) with wiring harness (15) and 5A in-line fuse holder (12) into boxed
enclosure (3).
f.
Connect the control unit (internal) harness connector to the control unit on the coolant
heater (4).
g.
Install 5A in-line fuse holder (12) on boxed enclosure (3) and secure with screw (9),
washer (10), and nut (11).
h.
Connect coolant hoses to COOLANT IN and OUT fittings (5) on boxed enclosure (3) as
tagged and secure with hose clamps.
i.
Replace cover (2) on boxed enclosure (3) and secure with two bolts (1).
j.
Refill engine coolant and bleed air from the system in accordance with the Technical
Manual, TM 5-3810-307-24-1-1.
Coolant Heater Control Unit. (Refer to Figures J-19 and J-20.)
Removal.
a.
Ensure battery disconnect switch is in the OFF position.
b.
Remove two bolts (1, Figure J-19) and remove cover (2) from boxed enclosure (3) of the
coolant heater (4).
c.
Disconnect control unit (internal) harness connector from control unit (2, Figure J-20).
d.
Remove three fillister head bolts (1) securing control unit (2).
e.
Carefully separate the control unit (2) and the burner assembly (4).
f.
Remove and discard seal (3). Ensure all remnants of the seal are removed from the
burner assembly (4). Use care to avoid damage to the sealing surface.
Installation.
a.
If installing a new control unit (2, Figure J-20) proceed to step b. Otherwise, remove all
remnants of the old seal (3) from the control unit (2). Use care to avoid damaging the
sealing surface.
b.
Ensure that both sealing surfaces are clean. Then apply liquid sealant (Form-a-
Gasket) to the sealing surface of the control unit (2).
c.
Install a new seal (3) on the control unit (2). Then install the control unit (2) on the
burner assembly (4). Secure the control unit with three fillister head bolts (1).
d.
Connect control unit (internal) harness connector to the control unit (2).
e.
Replace cover (2, Figure J-19) on boxed enclosure (3) and secure with two bolts (1).
Change-1 J-45
