Question about 1994 Ford Mustang

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I have a 1994 mustang that runs hot when setting idol but when driving it is fine. The fan is working. Do you know what it could be?

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  • kaguirre Jun 24, 2009

    OK, I just had my radiator flushed and it is still running hot. Only when sitting still. It will run almost to the H. What do I need to try next.

  • Steve Brown
    Steve Brown May 11, 2010

    unfortunately the 94 mustang and I am assuming that you have a v6 3.9L because they all run hot. And they all blow head gaskets. the thermostat cannot be changed to anything lower because it will throw codes in cool weather and turn the check engine light on. it runs like a 195degree thermostat which is super hot and the engine just runs hot to begin with. You may actually never get it to completely cool down. Is it blowing coolant out?

  • Steve Brown
    Steve Brown May 11, 2010

    the 94 mustang with 3.8L motor runs hot due to the thermostat being a high than normal like 195 degree. unfortunately theses motor are just hot.

    also, you could have a restriction in your radiator. dirt or whatever. have you flushed it or had it recored lately?



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First check your coolant level and if its full then Change the thermostat, that would be my first guess. Another possibility is a plugged radiator or head gasket. I would think if it was the head gasket it would do it while driving down the road, but if not the other 2 then thats what I would say it is. Good luck. Change the thermostat and post the results. I am leaning to a plugged radiator, get it flushed.

Posted on Jun 19, 2009

  • Chuck Brink Jun 24, 2009

    Change the water pump. It may be circulating, but not enough.


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Dirty radiator,inside. First try flushing cooling system. If that does not work, Have radiator removed and rodded.

Posted on Jun 19, 2009


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Have a 1994 mustang that is running hot when sitting still but goes back to normal when driving. The fan is working. Do you know what it could be.

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