Water boiling in degas bottle. - Ford Powerstroke Diesel Forum

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post #1 of 6 Old 05-13-2013, 03:12 AM Thread Starter
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Water boiling in degas bottle.

I'm hyper sensitive about anything out of normal with my engine and yesterday I was flushing the coolant out of my truck, after I drained the restore and refilled with water to flush out the rest of the restore. I ran it at a high idle maybe 1500 rpm for about 15 minutes and then shut it off to drain the water. I went to open the degas cap and noticed as I started opening the water began to boil. Is that normal or a symptom of a problem with my coolers?
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post #2 of 6 Old 05-13-2013, 05:20 AM
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If its plain water, yes. The cap allows the cooling system to build pressure and the higher the pressure the higher the boiling point of the coolant. So once you relieved the pressure on the cooling system you dropped the coolant boiling point and you saw it start to boil. If you had a 50/50, or what I use, 60/40 glycol mix the boiling point would be much higher and you shouldn't see boiling when you released the pressure.


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post #3 of 6 Old 05-13-2013, 05:21 AM
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It depends... Straight water will boil at 212 F at atmospheric pressure. How much coolant was still in the system? If straight water, it could have been localized boiling in the block or heads if the engine was hot. Parts of the heads may be greater than the average engine temperature and cause localized boiling.

How hot was your engine?

Depending on where you live, it will boil at a lower temperture (here in Colorado Springs straight water will boil at 199F - 6,300' elevation).

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post #4 of 6 Old 05-13-2013, 06:06 AM Thread Starter
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It was straight water and I'm at sea level so you're probably right. I dont' know how hot it was but it had been at a high idle for at least 20 minutes and it only boiled when I started to release the pressure by removing the cap, if I tightened it back down it stopped. Sorry for the stupid question but it just made me nervous knowing that one of the symptoms of EGR issues is the degas puking coolant.
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post #5 of 6 Old 05-13-2013, 06:27 AM
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It may not have been boiling, but possible. When you start to removed the cap the hoses will flex back to normal size, pushing water and sometimes air pockets (you said you were doing a flush) to the degas bottle. That can be similar to boil or gurgle. Now, flash boil is possible from localized heat in the EGR cooler (most likely) or the heads (least likely) if you didn't let it run at low idle for a few minutes. Most often the flash boil requires higher load and heat parameters.

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post #6 of 6 Old 05-13-2013, 06:31 AM
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Quote:
Originally Posted by calveryc View Post
Sorry for the stupid question
There are no stupid questions, just stupid or rude answers.



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