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 TM 55-1905-223-24-5
Table 2-2. Troubleshooting-CONT
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
h. If no bubbles are present, do the following:
(1) Remove the test equipment.
(2) Check coolant level and fill if necessary.
(3) Install the expansion tank pressure cap.
(4) Operate the engine until it reaches a temperature of 180 (80 ) and check for coolant leaks.
F
C
STEP 8. Check for over concentration of antifreeze and/or supplemental coolant additives.
Check coolant concentration (TB 55-1900-207-24).
STEP 9. Check for incorrect or malfunctioning thermostat, do the following:
a. Remove the upper radiator hose from the thermostat housing.
b. Install a hose of the same size on the thermostat housing outlet long enough to reach a remote
dry container used to collect coolant.
c. Install and tighten a hose clamp on the housing outlet.
d. Install the end of the hose in a dry container.
e. Operate the engine at idle for one (1) minute.
f. Shut the engine off, and measure the amount of coolant collected in the container.
g. The amount of coolant collected must not be more than 3.3 fluid ounces (100 cc).
h. If more than 3.3 fluid ounces (100 cc) of coolant is collected, the thermostat seal is leaking.
i. Remove the thermostat and inspect thermostat and thermostat seal (para. 2-24).
STEP 10. Water pump malfunctioning.
Replace water pump (para. 2-29).
STEP 11. Check for obstructed or damaged oil cooler.
Replace oil cooler (para. 2-30).
2. Coolant temperature below normal.
STEP 1. Check for malfunctioning temperature gauge.
a. Test the gauge as follows:
(1) Check for a tripped circuit breaker on the instrument panel (para. 2-22).
(2) Check the wiring from the gauge to the sending unit for a broken connection.
(3) Check the temperature sending.unit in the front upper water manifold for proper operating
temperature (para. 2-24).
(4) Use a temperature gauge of known accuracy to check system. -
(5) Replace faulty gauge (para. 2-22).
2-27
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