ENGINE
4-11
OVERHEAT TROUBLE SHOOTING
• Low coolant level
• Air in cooling system
• Wrong type/mix of coolant
• Faulty pressure cap or system leaks
• Restricted system (mud or debris in radiator fins causing
restriction to air flow, passages blocked in radiator, lines,
pump, or water jacket, accident damage)
• Lean mixture (vents, fuel pump or fuel valve)
• Fuel pump output weak
• Electrical malfunction
• Water pump failure/ Loose impeller
• Thermostat failure
• Cooling fan inoperative or turning too slowly (perform
current draw test)
• Low oil level
• Spark plug incorrect heat range
• Faulty hot light circuit
• Thermostat stuck closed or not opening completely
Temperature Too Low
• Thermostat stuck open
Leak at Water Pump Weep Hole
• Faulty water pump mechanical seal (coolant leak)
• Faulty pump shaft oil seal (oil leak)
Be sure to install the pressure cap before
shutting off the engine. Coolant may spit out
of the radiator.
10. Repeat 8 to 9 step. If no bubbles are seen at the filler neck,
the system should be purged of air.
11. Stop the engine and let cool, top off the radiator filler neck
with coolant. If you hear or see a “glop” at the filler neck, or
there is a dropping of the coolant level, indicating that coolant
has been pulled into the system; Fill the recovery bottle only
after you have completely filled the cooling system at the
radiator filler neck.
12. Repeat this procedure, if overheating still occurs.
To Next Page
Loading...
Need help?
General
