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yet another batch of problems:air bubbles in cooling system

 
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Old 10 May 2018, 09:30 pm
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Join Date: Aug 2016
Location: ohio
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Default yet another batch of problems:air bubbles in cooling system

my latest batch of problems '06 TE standard motor

overheating when an air bubble forms in the cooling system

for various reasons we have replaced
The radiator
filler neck
thermostat
water pump
upper and lower hoses
radiator cap

I cannot discern how the coolant is escaping, other than the overflow tank.
we pressure tested the cooling system up to 20#
checked the radiator cap and replaced it as well.

no apparent water in exhaust, coolant looks clean (no oil) no water/coolant in oil
no apparent leaks hat I can see

when driving for a while, come home and turn it off and massive gurgling in the works.

my next step is pull the manifold, plugs and do a compression leakdown test, borescope to check out the cylinders etc, and put the ultraviolet dye in the system to see if it's coming out anywhere other than the overflow.

air is getting in somehow, and it's driving me buggy!
I really don't want to have to redo the head.
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Old 10 May 2018, 09:48 pm
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Default Re: yet another batch of problems:air bubbles in cooling system

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Old 10 May 2018, 10:16 pm
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Location: Thousand Oaks, CA
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Default Re: yet another batch of problems:air bubbles in cooling system

Your head might be cracked. If you remove your engine head take it in for resurfacing also have them check it for cracks.
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Old 11 May 2018, 03:23 am
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Join Date: Jan 2013
Posts: 1,266
Default Re: yet another batch of problems:air bubbles in cooling system

Something to try? Leave radiator cap off. Fill radiator to the top. Pressurize each cylinder with shop air. Watch the coolant each time. If the coolant spills over, the head/gasket should be changed.

If nothing spills out, don't assume that everything is ok.
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Old 11 May 2018, 10:22 am
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Join Date: Mar 2016
Location: Sacramento, CA
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Default Re: yet another batch of problems:air bubbles in cooling system

Welcome to the club. I've been chasing a similar problem since November although I think I've narrowed my symptoms to localized boiling due to the use of an engine sealant.

Did you do an emissions in the coolant test?
You can usually get a test kit as a loaner from a local auto parts store (Autozone for sure). You drive around for a while, stop the car and aspirate the air under the radiator cap through a blue liquid. If it turns yellow, you have exhaust gasses in the coolant. If it stays blue, your displacing gas is not engine exhaust. The gases stay in the coolant for a while but you can't do it on a cold engine. Make sure not to let the coolant touch the tip of the sucker or it will immediately turn the liquid yellow and give you a false positive.


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Old 16 May 2018, 06:56 pm
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Join Date: Aug 2016
Location: ohio
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Default Re: yet another batch of problems:air bubbles in cooling system

I bought the kit and did this. pretty conclusive a yes, something is leaking. Today the UPS dropped off the head gasket kit and new head bolts. A few days to clear out my workspace and it will be torn down, head crack tested, the works.




projects in the works.

rebuild 42" mower

full resto on a 1974 Ford 50" mower.

building a new shed,

Siding a house

ongoing work on my 99 F250

brake and fuel lines and upgrade a 2001 Silverado

and in my spare time, full resto on an 86 944 Porsche.

retirement is tiring...
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hobby car:87 Porsche 944, currently in restoration mode.
99 F250 for hauling stuff.
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