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Old 09-15-2009, 11:50 AM   #1 (permalink)
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ford 4.0 overheating

I have a explorer thats over heating. I replaced the thermostat and flushed the radiator. I,ve heard this is a common problem. My son had one and replaced the rad, themo,pump,heater core and head gasket. but never cured the problem. does anybody have an answer?
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Old 09-15-2009, 11:59 PM   #2 (permalink)
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Re: ford 4.0 overheating

Hi campbones

Check the radiator fan motor to see if its not seized and it's working properly. Check all wires, fuses, with a test light for current. Use a DVOM to test the fan relay and temperature switch for open circuits.

Last edited by octaneman; 09-16-2009 at 12:02 AM.
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Old 09-16-2009, 01:10 AM   #3 (permalink)
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Re: ford 4.0 overheating

if it has the small bypass hose on top of the thermostat housing the connection on top of the thermostat has a habit of blocking through corrosion
i used to use a 1/8th twist drill in my fingers to clear it on a australian ford
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