ENGINE
3.80
COOLING SYSTEM TROUBLESHOOTING
Overheating
S Low coolant level
S Air in cooling system
S Wrong type of coolant
S Faulty pressure cap or system leaks
S Restricted system (mud or debris in radiator fins or restriction to air flow, passages blocked in
radiator, lines, pump, or water jacket)
S Lean mixture (restricted jets, vents, fuel pump or fuel valve)
S Fuel pump output weak
S Restricted radiator (internally or cooling fins)
S Water pump failure
S Cooling system restriction
S Cooling fan inoperative or turning too slowly (perform current draw test)
S Ignition timing misadjusted
S Low oil level
S Spark plug incorrect heat range
S Faulty hot light circuit
S Thermostat stuck closed or not opening completely
Temperature Too Low
S Thermostat stuck open
Leak at Water Pump Weep Hole
S Faulty water pump mechanical seal (coolant leak)
S Faulty pump shaft oil seal (oil leak)
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