TM 5-3805-261-23-1
COOLING SYSTEM TROUBLESHOOTING PROCEDURES
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
WARNING
DO NOT service cooling system unless engine has been allowed to cool
down. This is a pressurized cooling system and escaping steam or hot
coolant may cause serious burns.
DO NOT remove cooling system radiator cap when engine is hot.
Allow engine to cool down. Loosen cap to first stop and let any pressure
out of cooling system, then remove cap. Failure to follow this warning
may cause serious burns.
Wear effective eye, glove, and skin protection when handling coolants.
Failure to do so may cause injury to personnel.
1.
Check for restrictions to air flow.
Replace damaged or missing parts (WP
1.
Engine Overheats.
Inspect fan blades, fan shields,
baffles, and plates.
still exists, go to Test 2.
2.
Check for proper belt tension and
Replace belts if necessary (WP 0061 00).
wear (WP 0061 00).
If the problem still exists, go to Test 3.
3.
Check hoses, lines, and fittings for
Replace hoses and clamps if necessary
leakage. Tighten loose connections.
go to Test 4.
4.
Check for loss of pressure.
Tighten radiator cap. Replace radiator cap
if necessary (WP 0065 00). If the problem
still exists, go to Test 5.
5.
Check for free flow of coolant
Flush radiator (WP 0065 00). Replace
through the radiator.
radiator if necessary (WP 0065 00). If the
problem still exists, go to Test 6.
6.
Inspect and test temperature
Replace temperature regulator if
regulator (WP 0059 00).
necessary (WP 0059 00). If the problem
still exists, go to Test 7
7.
Check coolant flow from open drain
If coolant is dirty and flow is slow, replace
outlet.
radiator (WP 0052 00). If the problem still
exists, go to Test 8.
8.
Check coolant pump operation.
Replace pump if necessary (WP 0060 00).
1.
Check condition of radiator cap.
Tighten radiator cap. Replace radiator cap
2.
Engine Does Not Reach
Operating Temperature.
if necessary (WP 0065 00). If the problem
still exists, go to Test 2.
2.
Inspect and test temperature
Replace temperature regulator
regulator (WP 0059 00).
(thermostat) if necessary (WP 0059 00).
