No. 17 Cooling System Concerns-Overheating: Notes

17	COOLING SYSTEM CONCERNS-OVERHEATING
DESCRIPTION	Engine runs at higher than normal temperature/overheats.
POSSIBLE CAUSE	Engine heat generation amount is excessive Engine speed is high and remains high for continuous long periods PCM DTC is stored Improper operation of A/C system Insufficient air blow volume Cooling fan inoperative Fan rotation speed decreases (such as generator malfunction) due to battery voltage decrease Cooling system cap malfunction Cooling fan motor assembly malfunction Cooling fan motor connector malfunction Improper indication of low engine coolant temperature indicator light and/or high engine coolant temperature warning light ECT sensor No. 1 malfunction Instrument cluster malfunction Blown fuse Engine coolant system malfunction Engine coolant performance deterioration Coolant leakage (engine internal, external) Improper water/anti-freeze mixture Thermostat malfunction (not fully open) Radiator malfunction (clogging) Improper engine coolant level Leakage around heater unit in passenger compartment Drive belt damage

COOLING SYSTEM CONCERNS-OVERHEATING

DESCRIPTION

POSSIBLE CAUSE

Engine heat generation amount is excessive
- Engine speed is high and remains high for continuous long periods
PCM DTC is stored
Improper operation of A/C system
Insufficient air blow volume
- Cooling fan inoperative
- Fan rotation speed decreases (such as generator malfunction) due to battery voltage decrease
Cooling system cap malfunction
Cooling fan motor assembly malfunction
Cooling fan motor connector malfunction
Improper indication of low engine coolant temperature indicator light and/or high engine coolant temperature warning light
- ECT sensor No. 1 malfunction
- Instrument cluster malfunction
Blown fuse
Engine coolant system malfunction
- Engine coolant performance deterioration
- Coolant leakage (engine internal, external)
- Improper water/anti-freeze mixture
- Thermostat malfunction (not fully open)
- Radiator malfunction (clogging)
Improper engine coolant level
- Leakage around heater unit in passenger compartment
Drive belt damage

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.