Question about 1991 Ford F350

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Over heat after new thermostat

I was overheating every time i had my plow on, and up.
replaced the thermo. blew out the rad. didn't have any problems for about 2 weeks.sitting at traffic light the guage went from not reading temp. to pegged over heating in 2 seconds. the rad. had a lot of pressure in it. as soon as i slowly released the pressure it was fine.
i think the rad. cap is set for 13 lbs. i think, i forgot to look yesterday. but i looked before the thermo. was replaced.
could it be the cap and if so, should i change the pressure setting? or what else could it be?
thanks, tim

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  • n1tim Jan 06, 2009

    thank you curt,

    i just bought the truck at the end of nov. it was overheating a lot and had the thermostat replaced and no problems for about 2 weeks, and at a light it did it again. i just checkd out the fan clutch, it feels just like my friends brand new one, took the rad. cap out and cleaned it. i'm going to replace it. i don't know obout the plow package, but i just replaced the alternator and 1 of the 2 batteries. i know i should replace both. i will try to keep the plow low, i just dont like to around here. our roads are terrible, r.i.


  • Anthony Peterson Jul 22, 2014

    check that nothing is pushing on ur radiator cap when u close the hood. I burnt my face on old cap that failed w/o a pressure relief on it when that one failed only to replace it and have wiring harness push down on it when i close hood.



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Hey Tim, I have a 90 F-250 w/ plow. Did u have overheating issues before, or did u just purchase the truck? As u know u really need a heavy duty cooling system to plow. A truck purchased for plowing should have the 'plow package' option, which includes heavy duty cooling (engine, which is usually a bigger radiator) heavy duty battery and alternator, trans. cooler, heavy duty front end (for extra plow weight). So, my question is, is this a new problem, or not? My truck is set up for the plow, but I still have to watch the temp. gauge. I only have temp issues when driving down the road, plow up, not doing the actual plowing (sounds like your problem too). The plow up position blocks all incoming air to the radiator, so try driving with the plow as low as possible, and angle it all the way to one side, this will let the air flow, and works well w/ my truck. Let me know if this works for u or not. Curt

Posted on Jan 06, 2009


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