Radiator overflowing - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 10-11-2000, 10:06 PM
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Radiator overflowing

I.ve got a 75 CJ-5 with a sick 304.
I'll fill the radiator to about 1/2 inch below the fill neck bottom and the catch bottle to 3/4's. It will blow anti-freeze out the catch bottle vent, until the radiator is about half full. This will happen on the trail or just driving the 8 miles to work(temp 30 deg "Alaska"). I have tested the thermostat and it opens at the right temperature. My electric fan also runs alot more now, it even runs after a highway run on a cool day. The heater will only put out luke warm air.
I could use some help on this one, before I scratch all the hair off my head.

Keep Jeeping

Madd Mudder

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post #2 of (permalink) Old 10-11-2000, 10:37 PM
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Re: Radiator overflowing

Try Flushing the radiator yet?

<font color=blue> Muddynut</font color=blue>
<font color=red>[img]/wwwthreads_images/icons/cool.gif[/img]'79 CJ7 "Issues"-304-35s</font color=red>[img]/wwwthreads_images/icons/cool.gif[/img]
post #3 of (permalink) Old 10-11-2000, 10:54 PM
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Re: Radiator overflowing

Sounds to me like a cracked head/block or blown head gasket.
Try some stop leak, it could be a temporary fix.

Thanks, Ray

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post #4 of (permalink) Old 10-11-2000, 11:37 PM
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Re: Radiator overflowing

Don't overlook the simple things like the radiator cap. The cap could be weak and not holding pressure.

Good Jeepin'

Larry
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post #5 of (permalink) Old 10-12-2000, 12:34 AM
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Re: Radiator overflowing

I don't think it's the radiator it is only two years old, and I had some work done to it last year and it check out OK. I flushed the block last summer during a rebuild, at which time I got a new cap, but as we all know things do go bad, I'll check it tomarrow at work.

Thanks

Madd Mudder

post #6 of (permalink) Old 10-12-2000, 08:39 AM
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Re: Radiator overflowing

Ditto LEVE post...first try another radiator cap, and hope that fixes the problem. Then start worrying about the other post on head gasket or cracked head/block. Ouch!

Good luck with it. Turtle

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