Question about 1965 Ford Mustang

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1965 Ford Mustang 289 overheats at highway speed

Hi, the engine gets very hot at highway speed. At idle and cruising at 40 mph the temp is normal. The water pump is new, lower hose has spring in it and heads are rebuilt. the thermostat is 160 degree with a 16LB cap. Also checked that the head gasket was installed correctly (front label faces to front of engine. Any idea? I also noticed that the head gasket covers one of the water jacket ports in front of engine and the other port has only 1/8" hole in the gasket. The gaskets are correct for engine but why block one port and restrict another? Any suggestions. Thank you.

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  • Dave  C
    Dave C May 11, 2010

    Easy one, classic plugged radiator symptom.

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A partially blocked radiator will also cause htis symptom. Had this happen on two cars in the past. Take radiator to shop for rodding out and cleaning.

Posted on Apr 22, 2009

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If you have the head gaskets installed with front stamp toward the front this is correct. Cooling passages in the cylinder-head gasket must always go at the rear of the block to ensure proper cooling. This allows coolant to circulate completely through the block and heads on its way to the thermostat and radiator.
Usually if it overheats above 40 mph this idicates that exhaust gases are getting into the coolant either from a cracked or warped head. I would have a combustion leak test done. A combustion leak test is designed to check for the presence of combustion gases in the engine coolant. It should be performed when signs (overheating, bubbles in the coolant, rise in coolant level upon starting) point to a blown head gasket, cracked block, or cracked cylinder head. A block tester, often called a combustion leak tester, is placed in the radiator filler neck. The engine is started and the test bulb is squeezed and then released. This will pull air from the radiator through the test fluid. The fluid in the block tester is normally blue. The chemicals in the exhaust gases cause a reaction in the test fluid, changing its color. A combustion leak will turn the fluid yellow. If the fluid remains blue, there is no combustion leak.

Posted on Apr 16, 2009

  • Chuck Martin
    Chuck Martin Apr 16, 2009

    Or as Dave suggest maybe a partially clogged radiator.

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Your raidator fins my be clogged and also you shouldnt have a clutch fan on it it should be a locked fan!!!! for more air flow!!!

Posted on Apr 16, 2009

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Its a 9-inch differential at best. Try this link for more data:

1965 Mercury Comet Cyclone

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