Big air bubble in coolant system? - Ford Powerstroke Diesel Forum
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post #1 of 15 Old 11-08-2015, 12:50 PM Thread Starter
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Big air bubble in coolant system?

Hello everybody not sure where I should start but I replaced my thermostat yesterday and refilled the engine with distilled water and anti-freeze. I started it up earlier today to check for leaks about 10-15 minutes idle no problems coolant level good and no leaks. Then drove it about 30 highway miles to work any air bubbles that it may have had when I stopped to look at everything I wiggled the coolant reservoir couldn't see any movement thought I was low. So with coolant temp at 202F I opened the cap and a lot of coolant came out, if I had to guess about 4 gallons and with enough force to cover my hood. After that did the 30 miles back home coolant temps were normal and level stayed the same about 3/4 of the reservoir.

So would a big air bubble cause it to shoot out like it did and since most if not all of the coolant that I put in came out should I be worried? The truck has now been sitting for over an hour and the coolant level is about 1/2 of the reservoir.


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post #2 of 15 Old 11-08-2015, 12:52 PM
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you spewed 4 gallons as you opened the cap slowly ??
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post #3 of 15 Old 11-08-2015, 12:58 PM
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I doubt it was 4 gallons man, maybe 1 gallon.....4 gals is over half the capacity. And yeah a big air bubble will do just what you describe if you don't slowly open the cap to relieve the pressure

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post #4 of 15 Old 11-08-2015, 01:12 PM Thread Starter
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I wouldn't say slowly but I turned it till I heard hissing then when it stopped I turned it the rest of the way and it bounced off my hood along with a bunch of my coolant like a fire hose for about 1 second. So if a air bubble did it how do I get it out?


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post #5 of 15 Old 11-08-2015, 01:22 PM
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Sounds like you already did
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post #6 of 15 Old 11-08-2015, 01:29 PM Thread Starter
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Quote:
Originally Posted by nighthawk285 View Post
Sounds like you already did
Then why didn't my coolant level drop? I filled it to 1/2 then drove it, blew some out and it's still at 1/2.


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post #7 of 15 Old 11-08-2015, 01:35 PM
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The air escaped when you opened the cap and blew coolant everywhere.....might consider a new degas cap too while you're in the area, sounds like it wasn't relieving pressure very well
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post #8 of 15 Old 11-08-2015, 01:41 PM
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I'm guessing that you didn't lose nearly as much as it appeared. Spills are like that. The last beer that I spilled was like a million ounces.

Drive it for a bit. Let it cool. Release the pressure. Add coolant if necessary. Drive it more. Hard. Let it cool. Repeat as needed.

...and, for heaven's sake, don't ever do what you did again (without videotaping).

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post #9 of 15 Old 11-08-2015, 01:44 PM Thread Starter
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Quote:
Originally Posted by djmaguire View Post
I'm guessing that you didn't lose nearly as much as it appeared. Spills are like that. The last beer that I spilled was like a million ounces.

Drive it for a bit. Let it cool. Release the pressure. Add coolant if necessary. Drive it more. Hard. Let it cool. Repeat as needed.

...and, for heaven's sake, don't ever do what you did again (without videotaping).
Okay and lol I wish I had recorded it because then I could post it saying what cause this.
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post #10 of 15 Old 11-08-2015, 01:47 PM
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Am I the only one that feels the athe OP is incredibly lucky to not have scalded himself. The do not open hot on the cap is no joke. That cap should have hissEd for a solid couple minutes to relieve pressure.
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