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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 08-08-2012
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4.0 ohv overheating help

i have a 98 with a 4.0 ohv and when i go uphills in the summer my tempeture sky rockets. it wouldnt be a big deal but i drive hills everyday at 40 mph and i dont want to overheat when i hit the top. i know this is a common problem with rangers so whats the fix?
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Old 08-09-2012
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Check your coolant.

Only time rangers overheat is when they have cracked heads or blown head gaskets. When they do get hot they will crack heads.
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Old 08-09-2012
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get a new thermostat too.
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Old 08-09-2012
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well i just put some antifreeze in it and its fine unless i am pulling a hill so i figured it had to be not getting enough cold air flow somewhere
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Old 08-10-2012
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If you are loosing coolant and cant find the leak odds are you have a cracked head.


Check your plugs in the middle cylinders.

Once you go over about 30 the is enough airflow to keep the truck cool without the fan.
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Old 08-12-2012
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I blew a heater hose a few years ago at the top of a long uphill. Overheated instantly and cracked a head. After replacing the head, gaset, thermostat, water pump, fan clutch, and radiator, it still overheated when I went up a hill. Thought I cracked the block, but it turned out the sending units were wacked. Replaced the sending units (one for the computer, 1 for the gauge), it never got hot again. Check your sending units. I also installed a water temp and real oil pressure gauge just to be sure.
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