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Old 06-17-2003, 05:21 PM
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5.0 overheating

My 93 5.0 w/ ac overheats while putting around town when the ac is on. It had a 3 core radiator cooling it, but I upgraded to a 4 core and it still overheats. It doesnt overheat as long as the ac is off. I have a fresh thermostat as well. Any ideas?

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Old 06-17-2003, 07:56 PM
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It doesnt overheat as long as the ac is off.
Does your car have an electric fan for when the A/C is on. Usually most late model cars have an electric fan (either the main fan or an auxiliary fan) that should be on anytime the A/C is turned on. A bad fan relay could screw this up and cause you to overheat when the A/C is on.


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Old 06-17-2003, 08:38 PM
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no electric fans on 5.0 mustangs, only the clutch driven fan.....could it be a bad clutch?
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Old 06-18-2003, 12:18 AM
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Roll down the windows and turn the heater on full blast and see if the temp drops during the overheat condition. The heater acts like an extension of your radiator adding just a little more capacity to your cooling system. Check the knowledge base for more info on overheating.
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Old 06-18-2003, 12:46 AM
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If you don't have a shroud over your fan, you might consider adding one ... my temp was going up higher than I like with the AC on, too, and I was thinking about adding a shroud to my fan - it's the next step (in my mind) to best add cooling to the engine.

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Old 06-18-2003, 02:28 PM
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Does your car have an electric fan for when the A/C is on.
I would put in an electric fan in front of the rad that's hooked up to the ac switch that will make it turn on when ever the ac is on. If it works for most late model cars, y wouldn't it work for 5.0?
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Old 06-19-2003, 08:38 AM
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Thanks for the ideas. Do you think the fact that the whole driveline is setting at the wrong angle(trans too high, driveshaft scrapping e-brake line, engine tilting down to where it has rubbed a section out of the fan?) Do you think replacing the transmisson mount and getting a new clutched fan would help some too?
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