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55. TROUBLESHOOTING COOLING SYSTEM - Continued
Corrective action
Malfunction
Probable causes
b.
Replace coolant thermo-
b.
Defective coolant thermo-
1.
Engine overheats -
stat (par. 76). Replace
stat or sending unit.
Continued.
water temperature
sending unit (par. 75).
c.
Remove water pump as-
c.
Defective or plugged
water pump.
sembly (par. 77a). Re-
build water pump (pars.
77b through d). Install
water pump assembly
(par. 77e).
d.
Refer to fuel system
d.
Lean fuel mixture.
troubleshooting (par.
e.
e.
Defective oil cooler
Refer to lubrication
troubleshooting (par. 54)
bypass valve or plugged
for high engine oil tem-
oil cooler.
perature condition.
a.
--.
a
Replace coolant thermo-
2.
Defective coolant thermo-
Engine fails to
stat or the thermostat
reach normal
has improper heat range.
operating tem-
perature.
Replace defective water
b.
Defective water temper-
b.
ature sending unit or
temperature sending
gage.
--.
a
a.
Refer to TM 9-2320-
3.
Loose or damaged hoses.
Loss of coolant.
Hose connections or
235-20. Repair or re-
place hose connections.
coolant line gaskets
Check vehicle radiator
leaking.
for leaks. Replace
leaking gaskets where
necessary.
b.
Water pump seal leaking.
b.
Remove water pump
water pump (pars. 77b
through d). Replace
water pump when
damaged beyond repair.
Install water pump (par.
56

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