radiator boil over
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New User
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radiator boil over
My 1979 Ford F150 351M engine- radiator boils over after about 5 minutes driving. I have put in a new water pump, thermostat, radiator cap, flushed the radiator and this still happens.
Anyone have any ideas what could be wrong?
Has anyone had the same experience ?
Anyone have any ideas what could be wrong?
Has anyone had the same experience ?
Elder User
Joined: Mar 2003
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From: AZ.
radiator boil over
Did you check the condition of the bottom hose? They get soft with age and may suck closed, restricting the water flow...Some had a coiled wire inside for support that would rust away...
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Joined: Apr 2000
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From: SD
radiator boil over
Welcome to FTE... 
Has it always been doing this, or did it just start? If it did just start, what happened just before it started acting up? Were any repairs or damage done? Is that 5 minutes of slow driving or highway?
Marty
Has it always been doing this, or did it just start? If it did just start, what happened just before it started acting up? Were any repairs or damage done? Is that 5 minutes of slow driving or highway?
Marty
Elder User
Joined: Aug 2003
Posts: 727
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From: Texas, just south of NY c
radiator boil over
even if they flushed out your radiator.....they should have "rodded it out as well!! If they didn't do this it could still have a significant amount of blockage to cause excess heat to buildup in the system. I would ask the radiator guy if he performed this on Your radiator. sk
Lead Driver
Joined: Nov 2000
Posts: 6,650
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From: Albuquerque
radiator boil over
If it does it that quick I would suspect a complete blockage somewhere. collapsed hose, thermostat upside down, maybe severe belt slip on the pump?
Does it run OK up till then? Blown head gasket or cracked head are some of the worse possibilities.
Does it run OK up till then? Blown head gasket or cracked head are some of the worse possibilities.
Posting Guru
Joined: Aug 2002
Posts: 1,214
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From: Minneapolis, MN
radiator boil over
One test to try... When the engine is cold, remove the radiator cap (to relieve any pressure) and put it back on. Start the engine, rev it a couple of times and shut it right off. Then loosen the cap to see if there's any pressure build up. If there is, that would mean that combustion pressure is getting into the cooling system. Either a blown head gasket or cracked head.
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radiator boil over
The motor has been head tested. There are no combustible leaks. When the motor is running, with the radiator cap off, the coolant doesn't move. I tried all the suggestions. It's not any of them. I'm beginning to think it is the radiator-the rad is bad. It is 8 years old. Thanks for all the info. I
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