TM 9-2320-280-20-3
10-87. HEATER ASSEMBLY REPLACEMENT
This task covers:
a. Removal
b. Installation
INITIAL SETUP:
Tools
General mechanic’s tool kit:
automotive (Appendix B, Item 1)
Materials/Parts
Four locknuts (Appendix G, Item 65)
Nut and lockwasher assembly
(Appendix G, Item 144)
Tiedown strap (Appendix G, Item 239)
Manual References
TM 9-2320-280-10
TM 9-2320-280-24P
Equipment Condition
l Battery ground cable disconnected (para. 4-73).
l Cooling system drained as required (para. 3-60).
Q Weathercap removed (para. 3-18).
l Air cleaner assembly removed (para. 3-12).
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Remove tiedown strap (11) from cable (12) and clamp (10). Discard tiedown strap (11).
Loosen clamp (10) and disconnect diverter box duct (8) from heater assembly (9).
Disconnect harness lead 400D (13) from heater assembly lead (14).
Remove nut and lockwasher assembly (18) and lead 57E (19) from heater assembly (9). Discard nut
and lockwasher assembly (18).
Loosen two clamps (1) and disconnect heater inlet hose (2) and heater outlet hose (16) from inlet
port (3) and outlet port (15).
Loosen clamp (21) and remove hose (20) from clamp (21) on heater assembly (9).
Remove three screws (23) and washers (24) from air intake neck (22) and cowl (25). Remove
neck (22) for access to heater mounting hardware.
Remove four locknuts (4), washers (5), capscrews (6), and washers (5) from heater assembly (9) and
body (7). Discard locknuts (4).
Remove ten clips (26) from heater boot (27) and heater assembly (9).
Slide heater assembly (9) right and away from firewall (17) to allow heater inlet port (3) and outlet
port (15) to clear grommet openings in firewall (17) and remove heater assembly (9).
I
b. Installation
I
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Install heater assembly (9) on firewall (17) and insert heater inlet port (3) and heater outlet
port (15) through grommet openings in firewall (17).
Install heater boot (27) on heater assembly (9) with ten clips (26).
Install heater assembly (9) on body (7) with four washers (5), capscrews (6), washers (5), and
locknuts (4). Tighten locknuts (4) to 15 lb-ft (20 N.m).
Install air intake neck (22) on cowl (25) with three washers (24) and capscrews (23). Tighten
capscrews (23) to 6 lb-ft (8 N.m).
Connect heater inlet hose (2) and heater outlet hose (16) to heater assembly (9) inlet port (3) and
outlet port (15) and tighten two clamps (1).
Install lead 57E (19) to heater assembly (9) with nut and lockwasher assembly (18).
Connect harness lead 400D (13) to heater assembly lead (14).
Connect diverter box duct (8) to heater assembly (9) and tighten clamp (10).
Install hose (20) in clamp (21) on heater assembly (9) and tighten clamp (21).
Install cable (12) on clamp (10) with tiedown strap (11).
10-144
