Symptom Chart

SYMPTOM CHART

Condition	Possible Causes	Action
Loss of coolant	Radiator.	Go to PINPOINT TEST A .
	Pressure relief cap.
	Coolant pump seal.
	Radiator hoses or clamps.
	Heater hoses.
	Heater core.
	Engine gaskets.
	Degas bottle.
	Water outlet.
	Thermostat O-ring seal.
	Coolant crossover gaskets (intake manifold).
	Heater return tube O-ring seal.
The engine overheats	Coolant thermostat.	Go to PINPOINT TEST B .
	Coolant pump.
	Internal engine coolant leak.
	Radiator.
	Cooling fan.
	Fan clutch.
	Pressure relief cap.
	Insufficient water or coolant in coolant mixture.
	Fan belt.
	Restricted airflow.
	Low coolant level.
The engine does not reach normal operating temperature	Coolant thermostat.	Go to PINPOINT TEST C .
The block heater does not operate correctly	Block heater power cable.	CHECK the resistance of all three circuits in the power cable. If any circuit measures greater than 5 ohms, INSTALL a new power cable.
The block heater does not operate correctly	Block heater.	CHECK the resistance of the block heater. If it does not measure between 12.5 and 17 ohms, INSTALL a new block heater.