1988 Ford Bronco II Overheating - Engine

Question: MY '88' FORD BRONCO II IS STARTING TO OVERHEAT WHEN DRIVING AND GETS WORSE AS I INCREASE IN SPEED ESPECILY HIGH SPEEDS (60MPH) SO WHEN IDLEING IT HEATS UP. EVEN WHEN THE A/C IS OFF. BOTH RADIATOR HOSES HAVE BEEN REPLACED AND THE FAN CLUTCH, RADIATOR FLUSHED WATER PUMP IS FINE AND I TOOK THE THERMOSTAT COMPLETELY OUT. I KNOW I NEED SOME VVE COVER GASKETS, BUT THAT SHOULD NOT CAUSE IT RUN HOT LIKE IT IS DOING. TRUCK HAS 178, 000 MILES 5 SPEED W/ OD MANU TRANS, 2.9L V6, A/C, POWER STEERING.USED TO RUN VERY COOL.

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Technican: Are you losing any coolant? If you are you need to check for a blown head gasket. You can either have a radiator shop 'sniff' the coolant for the presense of exhaust gases. Or rent (for a fully refundable deposit) a tool that is used to pressurize the cooling system and see if it leaks down. This tool is available at Autozone (there are other stores that offer this service, call ahead). BTW- How did you check the water pump? Did you observe coolant flow through the radiator?

Owner: I AM NOT LOSING ANY COOLANT, AND THE WATER PUMP WAS CHECKED BY A MECHANIC AND HE SHOWED ME IT WAS IN GOOD WORKING CONDITION AT A PIT STOP MECHANIC SHOP. WE OBSERVED FLOW THROUGH THE RADIATOR AND BOTHE HOSES.

Technican: If the impellers on the water pump are good and it continually pumps coolant through the system- 1. You have exhaust gases entering the cooling system (IE- blown head gasket) 2. The radiator is partially blocked and not doing it's job (flushing will not always work) 3. The new fan clutch is defective (slim chance but must be checked) With a cold engine- 1.Remove the radiator cap 2. Start the engine and allow it idle 3. Over the next several minutes observe coolant flow through the radiator Do you see any air bubbles? Use caution because at anytime the coolant could spray out. Always use extreme caution around moving engine parts. FYI- With the thermostat out, normally the engine will not reach peak operating temperature and will be less efficient. In rare circumstances engine damage can occur. Let me know what you find.

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