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Old 10-20-2010, 09:00 PM
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foamy antifreeze

im pretty well ready to give up every engine we put in this truck goes to hell. well today while driving the truck the temp went up to 220* and when the rad. cap was taken off the antifreeze has a thick layer of foam on it. what could this be?

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Old 10-20-2010, 09:02 PM
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Think its normal, that or it still has a bit of air in the system, or is low on antifreeze. I always leave the cap off the rad, then let the engine get warm, then hold the rpms up a bit and fill the rad up. Starts circulating water, so the little spaces in the colling system dang sure have water in them, so i know its all the way full.
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Old 10-20-2010, 09:04 PM
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Quote:
Originally Posted by BigRoy1978
Think its normal, that or it still has a bit of air in the system, or is low on antifreeze. I always leave the cap off the rad, then let the engine get warm, then hold the rpms up a bit and fill the rad up. Starts circulating water, so the little spaces in the colling system dang sure have water in them, so i know its all the way full.
Hopefully, i've been reading and people are saying blown headgasket or cracked head.
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Old 10-20-2010, 09:06 PM
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If its a blown head/gasket, with the rad cap off and the engine warm, rev the pi$$ out of it, it water goes spewing EVERYWHERE out of the rad, its a bad head or gasket.

Every cracked head/ blown gasket ive had did that. Or even simpler, if its putting any white smoke out the exhaust on one side.
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Old 10-20-2010, 09:08 PM
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Quote:
Originally Posted by BigRoy1978
If its a blown head/gasket, with the rad cap off and the engine warm, rev the pi$$ out of it, it water goes spewing EVERYWHERE out of the rad, its a bad head or gasket.

Every cracked head/ blown gasket ive had did that. Or even simpler, if its putting any white smoke out the exhaust on one side.
That's simple i guess i will try that tomm. thanks.
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Old 10-21-2010, 03:05 PM
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well i tried that thing today and it'll spew out antifreeze when you let of the throtle but if you rev it dont do it. so revved it doesn't and when throttle is let off it instantly spews. idling it's fine though.
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Old 10-21-2010, 03:22 PM
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Most likely the foam is a little bit of oil or some other contaminant. See if you can take some out and put it in a glass jar an let it sit for a while. It will most likely separate and it will be easier to tell what it is. May be a leaky transmission cooler that is leaking into the radiator.
In most circumstances 220 would not be considered overheated. What is the thermostat rating.
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Old 10-21-2010, 05:06 PM
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Quote:
Originally Posted by T-bucket23
Most likely the foam is a little bit of oil or some other contaminant. See if you can take some out and put it in a glass jar an let it sit for a while. It will most likely separate and it will be easier to tell what it is. May be a leaky transmission cooler that is leaking into the radiator.
In most circumstances 220 would not be considered overheated. What is the thermostat rating.
well just pulled the passenger side valve cover off and you can see that there is moisture on it. the t stat is 160 and it normally ran 180-190 and just two days ago it started to run 220. had a friend rev his truck and it sprays out as rpms go up but mine just sucks down. when he lets off it settles and when i let off it sprays. like the complete opposite.
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Old 10-21-2010, 07:18 PM
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Trany cooler

The only time I ran into that it wound up being the transmission cooler in the radiator. T-Bucket23 gave great advice about taking a sample of the liquid and allowing it to separate. That will at least tell you the type of oil causing the foam.

good luck.
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Old 10-22-2010, 06:09 AM
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Quote:
Originally Posted by Onefunponcho
The only time I ran into that it wound up being the transmission cooler in the radiator. T-Bucket23 gave great advice about taking a sample of the liquid and allowing it to separate. That will at least tell you the type of oil causing the foam.

good luck.
just pointing this out, there is water on the inside passenger valve cover.
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Old 10-22-2010, 07:00 AM
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Is it water as in condensation or anti-freeze/water mixed into the oil?
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Old 10-22-2010, 08:42 AM
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Quote:
Originally Posted by Onefunponcho
Is it water as in condensation or anti-freeze/water mixed into the oil?
it has a buch of white bubles and the oil is thin on it. other side valve cover is just oil though.
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Old 10-22-2010, 09:49 AM
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My guess is you have a blown head gasket. Between the oil and antifreeze passages. Is there moisture under just one valve cover or both? I would suggest draining the oil and checking for antifreeze in it..
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Old 10-22-2010, 04:09 PM
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Yikes

Sounds to me you have a blown head gasket.... Sorry to hear of your misfortune.
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Old 10-22-2010, 10:03 PM
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Originally Posted by 65smallblock
My guess is you have a blown head gasket. Between the oil and antifreeze passages. Is there moisture under just one valve cover or both? I would suggest draining the oil and checking for antifreeze in it..
the passenger side is the only side with moisture. the oil is good i just did a test drain and it was clean. i have dealt with 2 other blown gaskets on differnt motors, but this is just so strange. just another thing, the #4 plug is completely white. antifreeze is rust colored and smells like stale cigarettes. how can i tell if its the head cracked or the gasket leaking?
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