Engine Controls - Trouble Shooting - No Codes: Symptoms: Overheating

Check for insufficient coolant.
Check for loose water pump belt.
Check for faulty thermostat.
Check for poor water pump performance.
Check for improper ignition timing.
Check for clogged or leaky radiator.
Check for low oil level.
Check for poor oil pump performance.
Check for dragging brakes.
Check for blown cylinder head gasket.