IF THE COOLING FAN IS ELECTRICAL AND NOT WORKING, MAKE SURE FUSES ARE GOOD AND SWAP OUT THE RELAYS, IF STILL NOT WORKING REPLACE THE FAN. IF MECHANICAL FAN, START TRUCK, RUN THE ENGINE AT 2000 RPM FOR 2 MINUTES WITH THE HOOD OPEN AND UP, AS FAST AS YOU CAN TURN OFF THE ENGINE AND LOOK AT THE FAN, IF IT'S STILL SPINNING REPLACE THE FAN IF NOT LOOK FOR SOMETING STUCK ON THE FRONT OF THE GRIILE BY CONDENSOR, MAKE SURE THERES NO AIR BUBBLES IN THE COLANT SYSTEM, ALSO WHILE THE ENGINE IS HOT AND THE HEATER BLOWING HOT AIR FEEL HOSES AND RADIATOR FOR A WARM TO COOL SPOT, THIS INDICATE A AIR POCKET OR BLOCKAGE. IF ALL OK SUSPECT HEAD GASKETS. I HOPE I HELEPD AND PLEASE ACCEPT IF SATISFIED. THANKS T-MAN
i hope this helped and please accept if satisfied. thanks T-MAN
Inspect for a missing or damaged radiator side or upper baffle and/or radiator air deflector.
Is the baffle and/or deflector missing or damaged?
Go to Step 8
Go to Step 2
Inspect for a loss of coolant.
Is there a loss of coolant?
Go to Step 3
Go to Step 4
Fill the system to the specified level.
Does the engine overheat?
Inspect for low temperature protection.
Is the coolant to the correct concentration?
Go to Step 5
Inspect for a loss of cooling system pressure.
Is there a loss of system pressure?
Go to Step 6
Inspect for a faulty engine coolant temperature (ECT) sensor. Refer to DTC P0117 and DTC P0118 .
Is the sensor operating properly?
Go to Step 7
Inspect for the following:
Were any of the above found?
Go to Step 10
Repair or install new parts as necessary, then retest.
Go to Step 9
Inspect for incorrect drive belt tension.
Is the belt tension correct?
Is the water pump driveshaft damaged or is the seal leaking?
Go to Step 11
Inspect for obstructed radiator air flow or bent radiator fins.
Is the radiator air flow obstructed?
Go to Step 12
Inspect for blocked cooling system passages.
Are the cooling system passages blocked?
Go to Step 13
Inspect for inoperative fan clutch. Refer to Fan Clutch Diagnosis .
Is the fan clutch operating correctly?
Go to Step 14
Inspect the thermostat. Refer to Thermostat Diagnosis .
Is the thermostat stuck in the closed position?
Go to Step 15
Go to Step 16
Replace the thermostat. Refer to Engine Coolant Thermostat Housing Replacement .
Inspect the radiator cooling capacity.
Is the proper sized radiator being used on the vehicle?
Go to Step 17
Consult the current parts catalog and replace the radiator. Refer to Radiator Replacement .
Is the repair complete?