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 Block heater | CHECK continuity in all 3 power cable circuits. If any circuit measures more than 5 ohms, INSTALL a new power cable. CHECK the resistance of the block heater. If the resistance does not measure between 30 and 40 ohms, INSTALL a new block heater. REFER to: Block Heater (303-03C Engine Cooling - 5.0L 32V Ti-VCT/5.0L Ti-VCT V8 (308kW/418PS), Removal and Installation). |
The electric cooling fan is inoperative in one or more speeds or does not operate correctly | Wiring Relays Fuses Cooling fan motor Cooling fan resistor | Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual. |
The electric cooling fan stays on all the time | Wiring Relays | Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual. |
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. REFER to: Cooling Fan Motor and Shroud (303-03C Engine Cooling - 5.0L 32V Ti-VCT/5.0L Ti-VCT V8 (308kW/418PS), Removal and Installation). |
Fan blade detached from fan motor | INSTALL a new cooling fan assembly. REFER to: Cooling Fan Motor and Shroud (303-03C Engine Cooling - 5.0L 32V Ti-VCT/5.0L Ti-VCT V8 (308kW/418PS), Removal and Installation). |
Pinpoint Tests
Loss of Coolant
Normal operation and Fault Conditions
The engine cooling system is a closed system providing for coolant expansion and contraction as well as changes in pressure as coolant warms and cools with engine operation. Various gaskets, seals, hoses and clamps contain coolant within the cooling system and keep other fluids and contaminants from entering the cooling system.
Possible Sources
Coolant hoses or tubes Hose clamps Thermostat O-ring seal or gasket Coolant pump O-ring seal or gasket Thermostat housing Oil cooler (may leak internally or externally)
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