TM 9-2320-272-24-2
3-400. ENGINE COOLANT HEATER HARNESS (M939/A1) REPLACEMENT
THIS TASK COVERS:
a. Removal
b. Installation
INlTlAL SETUP:
APPLICABLE MODELS
REFERENCES (TM)
M939/A1
TM 9-2320-272-10
TM 9-2320-272-24P
TOOLS
General mechanic's tool kit (Appendix E, Item 1) EQUIPMENT CONDITION
l Parking brake set (TM 9-2320-272-10).
MATERIALS/PARTS
l Hood raised and secured (TM 9-2320-272-10).
l Battery ground cables disconnected (para. 3-126).
Two lockwashers (Appendix D, Item 400)
Ten tiedown straps (Appendix D, Item 685)
1.
Open toolbox door (9).
2.
Disconnect engine coolant heater harness (2) from engine coolant heater (20).
3.
Remove nut (10), lockwasher (11), and ground wire (12) from terminal stud (13) on heater
pump (18). Discard lockwasher (11).
4.
Remove nut (17), lockwasher (16), and ground wire (15) from terminal stud (14) on heater
pump (18). Discard lockwasher (16).
5.
Remove ten tiedown straps (5) from engine coolant heater harness (2), fuel pump cable (6), hose (7),
and lead (22). Discard tiedown straps (5).
6.
Disconnect lead (22) from engine coolant heater harness lead (4).
7.
Disconnect engine coolant heater harness (2) from control box (1), slide through grommet (3) in
firewall (21) and grommet (8) in toolbox (19), and remove from vehicle.
b. Installation
1.
Slide engine coolant heater harness (2) through grommet (8) in toolbox (19) and grommet (3) in
firewall (21) and connect to control box (1).
2.
Connect lead (22) to engine coolant heater harness lead (4).
3.
Install ten new tiedown straps (5) on engine coolant heater harness (2), fuel pump cable (6), hose (7),
and lead (22).
4.
Connect ground wire (15) to terminal stud (14) on heater pump (18) with new lockwasher (16) and
nut (17).
5.
Connect ground wire (12) to terminal stud (13) on heater pump (18) with new lockwasher (11) and
nut (10).
6.
Connect engine coolant heater harness (2) to engine coolant heater (20).
7.
Close toolbox door (9).
3-980
