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Page Title:
COOLING SYSTEM TROUBLESHOOTING |
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 TM 9-2320-285-24-1
2-11.
COOLING SYSTEM TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
ENGINE OVERHEATS
WARNING
Remove radiator cap slowly to relieve pressure before completely removing when engine is hot. Failure to
follow this procedure could cause severe injury. If you are scalded by steam, seek medical aid immediately.
Step 1.
Check coolant level of radiator and coolant reservoir.
a.
If coolant level is low, add coolant (para 2-15a(l)).
b.
If coolant level is not low, go to step 2 below.
Step 2.
Pressure test radiator cap (para 2-15a(2)).
a.
If radiator cap pressure is not 6 to 9 pounds, or if pressure drops rapidly, replace radiator cap.
b.
If radiator cap pressure is 6 to 9 pounds, and remains steady for at least 30 seconds before dropping,
go to step 3 below.
Step 3.
Check if radiator fins are clogged.
a.
If radiator fins are clogged, clean (para 2-15a(l)).
b.
If radiator fins are not clogged, go to step 4 below.
Step 4.
Check coolant filter and hoses for leaks.
Check at top of filter element between filter head and filter element gasket for leakage.
a.
If leaks are observed, repair or replace defective components (para 2-15b(2)).
b.
If leaks are not observed, go to step 5 below.
Step 5.
Check for leaks in coolant heater, coolant heater pump, cab heater, and hoses.
a.
If heaters or hoses are leaking, replace (para 2-15e, 2-73a, or 2-73b).
b.
If leaks are not observed, go to step 6 below.
2-31
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