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COOLING SERVICE DIAGNOSIS
GENERAL COMPLAINT
PROBABLE CAUSE REMARKS
Engine Overheating
1. Not enough coolant. leaks. Refer to the OPERATION & MAINTENANCE
Add coolant to radiator and check cooling system for
MANUAL.
2. Engine overloaded.
Review operating instructions per OPERATION &
MAINTENANCE MANUAL.
3. Radiator obstructed preventing free air passage.
Remove obstruction. If exterior requires cleaning, apply
air or water pressure to radiator from engine side.
4. Fan belt slipping.
Check tension; replace belt if greasy or worn. Refer to
the OPERATION & MAINTENANCE MANUAL.
5. Damaged fan shrouds or no fan shrouds. Repair or install and adjust new fan shrouds.
6. Radiator cap not securely tightened to seal
pressure system.
Remove radiator cap and inspect. Replace cap if gas-
ket is worn. Tighten radiator cap to maintain pressure
in system.
7. Pressure relief valve on radiator cap faulty.
Replace cap. DO NOT repair or replace any regulating
valve parts.
8. Collapsed lines or loose connections on suction Inspect lines for internal collapse. Replace where
side. necessary.
9. Coolant temperature gauge or sending unit
faulty.
Test and/or replace parts as necessary.
10. Clogged radiator.
Flush with steam for external and internal clogs. Rod
out core tubes.
11. Scale deposits in crankcase or heads.
Reverse flush cooling system to remove scale. Check
soluble oil content.
12. Incorrect range thermostat. Remove and replace with correct thermostat.
13. Thermostat inoperative. Replace.
14. Worn water pump. Replace pump.
15. Drive system overheating. Refer to SECTION 7.
Engine Runs Cold
1. Extremely cold weather. Cover radiator.
2. Incorrect range or inoperative thermostat. Remove and replace with correct thermostat.
3. Temperature gauge or sending unit faulty. Test and/or replace as necessary.
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