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Old June 10th, 2013, 07:58 PM   #1
trailer jeep
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Default Won't stay cool

Need help i got cj7 with a 350sb aluminum radiator 7 blade flex fan no clutch with a fan shroud and 180 thermostat and I can't keep it cool on 2 tracks but if I drive about 20 mph it stays cool. I have flushed and cleaned everything that can be even a new water pump so what next? Rad is 20 by 21 by 3.
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Old June 11th, 2013, 09:02 AM   #2
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Thinks that come to mind are.

Water pump spinning wrong direction= serpentine belts with old pump or v belt with new pump.
Fan is not close enough to radiator or it is on backwards.
Shroud is not close enough to fan to make it effective.

Aftermarket flex fans suck imo. Never used one that worked better then a oe clutch fan.
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Old June 11th, 2013, 09:15 AM   #3
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check your timing too.
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Old June 11th, 2013, 09:36 AM   #4
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Generally, if you can be cool at 20mph or above, then the cooling system is sized/functioning well. Low speed cooling issues are usually the fan not moving enough air.

I would try a better fan, or a good electric one. With an OE style fan, the blades should be half in/half out of the shroud, as air is moved 'out' from the center of the fan, just as much as it is 'back' from the fan.

As someone mentioned, make sure the fan is pulling, and not spinning the wrong way....

Also, do you have an automatic transmission? If so, what tires and gears do you have? Too much transmission heat from improper gears could contribute. Although I would expect the fan is the culprit.
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Old June 11th, 2013, 10:10 AM   #5
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I'm with Jesus & bdd. Flex fans are not good for trail rigs. Get a good oe style fan or electric. I had this same conversation with a good friend and wheeling bud last summer, then he found out that flex fan blades flex when the hit water or mud. It cost him two radiators, and ruined a trip to drummond island before he finally agreeded, all due to the flex fan.

Last edited by RADRICK; June 13th, 2013 at 03:54 PM.
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Old June 12th, 2013, 05:05 PM   #6
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i agree, get rid of flex fan. go electric and be done with it.
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