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UENR4504-03
Symptom Troubleshooting
(Table 10, contd)
Troubleshooting Test Steps 6. Water Temperature Regulator
Values
Results
Water Temper- Result: The water temperature regulator is not operating ature Regulator correctly.
A. Check the water temperature regulator for correct operation. Refer to Systems Operation, Testing, and Adjusting, “Cooling System” for the proper procedure.
Repair: Replace the water temperature regulator. Refer to Disassembly and Assembly, “Water Temperature Regulator - Remove and Install”. Result: The water temperature regulator is operating correctly. Proceed to Test Step 7.
7. Engine Cooling Fan
Fan and drive belt
A. Check for a loose drive belt.
Result: The drive belt is not tensioned correctly. Repair: Tension the fan belt. Refer to Operation and Maintenance Manual, “Alternator and Fan Belts Replace”.
Note: A loose fan drive belt will cause a reduction in the air flow across the radiator.
Result: The fan is damaged. B. Check the engine cooling fan for damage. Repair: Repair the fan or replace the fan, as necessary. Refer to Disassembly and Assembly, “Fan - Remove and Install”. Result: The fan is OK and the fan belt is tensioned correctly. Proceed to Test Step 8.
8. Quality of Coolant A. Check the quality of the coolant. Refer to the Operation and Maintenance Manual, “Refill Capacities and Recommendations Coolant”.
Coolant
Result: The coolant is not of an acceptable quality. Repair: Drain and refill the coolant system with coolant of the correct quality. Refer to the Operation and Maintenance Manual, “Refill Capacities and Recommendations Coolant”. Result: The coolant is of an acceptable quality. Proceed to Test Step 9.
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