Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
Loss of engine coolant	Radiator Thermostat housing assembly Throttle body adapter heating Coolant pump seal Radiator hoses Heater hoses Heater core Engine gaskets Degas bottle	GO to PINPOINT TEST A .
The engine overheats	Low coolant level	GO to PINPOINT TEST A .
The engine overheats	Thermostat Airlock in the system Coolant pump Internal engine coolant leak Radiator Radiator airflow obstruction Cooling fan Pressure relief cap	GO to PINPOINT TEST B .
The engine does not reach normal operating temperature	Thermostat	GO to PINPOINT TEST C .
The block heater does not operate correctly	Block heater power cable	CHECK continuity in all 3 power cable circuits. If any circuit measures greater than 5 ohms, INSTALL a new power cable.
The block heater does not operate correctly	Block heater	INSTALL a new block heater.
The cooling fans are inoperative	Circuitry Fan control module Cooling fan motor(s)	Refer to the INTRODUCTION - GASOLINE article .