Pinpoint Test G92380p3: the Engine Overheats G92380t14: Check Coolant

PINPOINT TEST G92380p3: THE ENGINE OVERHEATS G92380t14: CHECK COOLANT

1. Inspect the coolant level.
^ Is the coolant level OK?

-> Yes
GO to Pinpoint Test G92380t15.

-> No
DIAGNOSE and REPAIR the coolant leaks. REFILL the cooling system. TEST the cooling system for normal operation.

G92380t15: CHECK THE CONDITION OF THE WATER PUMP DRIVE BELT

1. Inspect the water pump drive belt.
^ Is the water pump drive belt OK?

-> Yes
GO to Pinpoint Test G92380t16.

-> No
INSTALL a new water pump drive belt. TEST the cooling system for normal operation.

G92380t16: CHECK THE WATER PUMP DRIVE

1. Remove the water pump drive belt.
2. Attempt to turn the water pump drive pulley by hand.
^ Does the water pump drive pulley turn?

-> Yes
GO to Pinpoint Test G92380t17.

-> No
GO to Pinpoint Test G92380t18.

G92380t17: CHECK THE LEFT HAND EXHAUST CAMSHAFT

1. Remove the water pump.
2. Inspect the water pump drive shaft splines of the exhaust camshaft.
^ Are the drive splines OK?

-> Yes
Install a new water pump. TEST the system for normal operation.

-> No
INSTALL a new camshaft. Install a new water pump. TEST the system for normal operation.

G92380t18: CHECK THE OPERATION OF THE COOLING FANS

1. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
2. Connect a 100 ohm resistor to the engine coolant temperature sensor electrical connector.
3. Turn the ignition switch to the RUN position.
^ Are the cooling fans operating?

-> Yes
Turn the ignition switch to the OFF position. Connect the ECT sensor. GO to Pinpoint Test G92380t2O.

-> No
Turn the ignition switch to the OFF position. Connect the ECT sensor. GO to Pinpoint Test G92380t21.

G92380t19: CHECK THE AIR CONDITIONING CONDENSER AND RADIATOR CORE FOR OBSTRUCTION.

1. INSPECT the air conditioning condenser and radiator core for obstruction.
^ Is the air conditioning condenser or radiator core obstructed?

-> Yes
Remove the obstruction and clean the air conditioning condenser and radiator core. TEST the system for normal operation.

-> No
GO to Pinpoint Test G92380t21.

G92380t2O: CHECK THE OPERATION OF THE COOLING FANS WITH THE ENGINE RUNNING AT NORMAL OPERATING TEMPERATURE

1. START and RUN the engine until the ECT is between 95°C (203°F) and 105°C (221°F).
^ Are the cooling fans operating?

-> Yes
Turn the ignition switch to the OFF position. GO to Pinpoint Test G92380t21.

-> No
DIAGNOSE the electronic engine controls.

G92380t21 : CHECK THE TEMPERATURE OF THE RADIATOR

1. Check the radiator core temperature.
^ Is the radiator core hot?

-> Yes
GO to Pinpoint Test G92380t22.

-> No
GO to Pinpoint Test G92380t23.

G92380t22: CHECK THE RADIATOR CORE FOR COLD SPOTS

1. Check the radiator core for cold spots.
^ Does the radiator core have any cold spots?

-> Yes
Back-flush the radiator. TEST the system for normal operation. If the fault is still present, INSTALL a new radiator.

-> No
GO to Pinpoint Test G92380t23.

G92380t23: CHECK THE THERMOSTAT

1. TEST the thermostat. For additional information, refer to the component TEST in this section. Thermostat Test, Mechanical
^ Is the thermostat OK?

-> Yes
GO to Pinpoint Test G92380t24.

-> No
INSTALL a new thermostat. TEST the system for normal operation.

G92380t24: CHECK THE ENGINE OIL COOLER FOR A BLOCKAGE

1. Remove the engine oil cooler.
2. Check the engine oil cooler for a coolant blockage.
^ Is the engine oil cooler blocked?

-> Yes
Install a new engine oil cooler. TEST the system for normal operation.

-> No
INSTALL a new water pump. TEST the system for normal operation.