Symptom Chart

SYMPTOM CHART

Condition	Possible Sources	Action
Loss of coolant	Refer to the Diagnostic Routine	GO to PINPOINT TEST A .
The engine overheats	Refer to the Diagnostic Routine	GO to PINPOINT TEST B .
The engine does not reach normal operating temperature	Refer to the Diagnostic Routine	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 more 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 the resistance does not measure between 12.5 and 17.0 ohms, INSTALL a new block heater.
The electric cooling fan(s) is inoperative in one or more speeds or does not operate correctly	Wiring Relays Fuses Fan Control (FC) module Cooling fan motor(s) Cooling fan resistor(s)	REFER to the INTRODUCTION - GAS .
The electric cooling fan(s) stays on all the time	Wiring Relays	REFER to the INTRODUCTION - GAS .
Noisy electric cooling fan operation	Foreign material contamination Fan motor	REMOVE the foreign material from the cooling fan and shroud. TEST the system for normal operation. If still noisy, INSTALL a new cooling fan assembly.
Noisy electric cooling fan operation	Fan blade detached from fan motor	INSTALL a new cooling fan assembly.