Symptom Troubleshooting Index

TROUBLESHOOTING CHART

Symptom	Diagnostic Procedure	Also check for
Engine overheats	Check the coolant level Check for any engine coolant leakage (from gaskets, hoses, O-rings, etc) Check for dirt, leaves, or insects on the radiator and A/C condenser Check for deteriorated coolant Check for damaged or deformed fan shrouds Check the fan motors for proper direction of operation (blowing air toward the engine) Inspect the fan motors (see FAN MOTOR TEST ) or fan relays A/C condenser fan relay (see POWER RELAY TEST ) Radiator fan relay (see FIVE-TERMINAL TYPE ) Fan control relay (see FIVE-TERMINAL TYPE ) Check the radiator cap (see RADIATOR CAP TEST ) Check the thermostat (see FAN MOTOR TEST ) Inspect the water pump (see WATER PUMP INSPECTION ) Check for plugged or deteriorated radiator hoses Check for plugged heater core or hoses Check for a damaged cylinder head gasket	Proper radiator and condenser fan control and operation
The radiator fan does not run at high speed	Radiator fan high speed circuit troubleshooting (see RADIATOR FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )	Cleanliness and tightness of all connectors
Both the radiator fan and the A/C condenser fan do not run at low speed	Radiator and A/C condenser fans low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING )	Cleanliness and tightness of all connectors
The A/C condenser fan does not run at high speed	A/C condenser fan high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )	Cleanliness and tightness of all connectors