Question about 1966 Ford Mustang

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1966 Ford Mustang overheating

6 cylinder, standard trans., I have flushed the cooling system, replaced thermostat, new radiator cap, checked fan and belt but it still over heats intermittently. Can drive today and no problem, drive later short distance and over heats. No engine miss. No external coolant leaks visible, no water in oil. Could it be water pump ? Pump not noisy or leaking.
Suggestions please.

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  • bass_man63 Dec 02, 2008

    Coolant mix 50 % water, 50 % antifreeze

  • elandsverk Feb 05, 2009

    I have the same problem on a 1966 289V8. I replaced the radiator, waterpump, hoses, no thermostat and it still overheats. Could it be the head gasket? I need help.

  • Anonymous Mar 23, 2014

    Water pump leaking

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If you run the car with the cap off the radiator once the thermostat opens you should be able to see the water flow past the filler neckthat will tell you if the water pump is pumping but if it has an intermittant problem i would lean towards the thermostat may be sticking they only cost a few dollars so i would replace that first then go to a dealer or radiator shop and ask them to pressure test the system this will identify any pressure loss

Posted on Dec 26, 2008

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Try to run the water pump without hoses, and add water in the 'in' side, if is powers out the other side, then it's fine. how is your water/coolant mix?

Posted on Dec 01, 2008

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