Can't seem to purge air pocket - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 19 (permalink) Old 08-16-2010, 05:01 PM Thread Starter
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Can't seem to purge air pocket

I pulled the lower radiator hose the other day when changing the p/s pump.
I filled the degas bottle with g05/distilled water to the fill mark.

When running after a good drive, the tank is near empty. When the truck is cut off and cool, the bottle returns to the fill mark.

I also noticed that the coolant temp is about 15-20 degrees cooler than the oil temp. Usually it is no more than a 10 degree difference.(I put in a new oil cooler and coolant filter about 6 months ago)

How do I purge the air pocket? I have tried idling the motor with the degas cap off, but nothing seems to change.
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post #2 of 19 (permalink) Old 08-16-2010, 09:30 PM
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Re: Can't seem to purge air pocket

COuld you put a vacuum on the system so it sucks the coolant in?

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post #3 of 19 (permalink) Old 08-16-2010, 11:31 PM Thread Starter
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Re: Can't seem to purge air pocket

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Originally Posted by offroadinginaz View Post
COuld you put a vacuum on the system so it sucks the coolant in?
Yeah I guess I could. What hose would be the best one to pull to to that at though?
I am guessing my air pocket is at or near the oil cooler. wouldn't I want to pull the vacuum nearest where the air is trapped?
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post #4 of 19 (permalink) Old 08-20-2010, 03:19 AM Thread Starter
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Re: Can't seem to purge air pocket

I think the air has worked its way out.
The other day I came home and the tank was low, I topped it off while the motor was hot and running.
The tank now stays at the same level hot, cold, running or not.

The only thing that has me puzzled it that the coolant and oil temps still have a larger split than they should.

Today in normal traffic, ect was about 185 and eot about 210.
The oil cooler is 6 months old with about 12k miles. A coolant filter was installed when the oil cooler was replaced. Filter has been changed twice. Egr cooler was blocked off when the other work was done also.

Anyone have any thoughts?
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post #5 of 19 (permalink) Old 08-20-2010, 03:34 AM
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Re: Can't seem to purge air pocket

I would still guess an oil cooler

2006 F250 CCSB

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thanks to FCDP and Innovative Diesel
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post #6 of 19 (permalink) Old 08-20-2010, 03:43 AM
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Re: Can't seem to purge air pocket

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I would still guess an oil cooler
I agree

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post #7 of 19 (permalink) Old 08-20-2010, 05:02 PM Thread Starter
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Re: Can't seem to purge air pocket

Wouldn't the oil cooler slowly clog making the temp spread gradually?
Ever since I put in the new cooler, there was only a few degrees difference.
Only since pulling off the lower rad hose a few days ago, has there been such a difference in temperatures.

Also, since there is no egr cooler to worry about overheating, should I even be concerned about the oil temps?
Where is the coolant routed to after the oil and egr coolers?

If it means anything, I have noticed that the coolant temps have been on average about 10 degrees cooler than normal.
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post #8 of 19 (permalink) Old 08-20-2010, 11:32 PM
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Re: Can't seem to purge air pocket

You could have knock something loose in the system and the oil cooler acts like a coolant filter because the passages are so tight.

Having cool oil is the reason for a oil cooler. If your oil gets hot enough it will melt the stand pipe and put plastic through out your engine.

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post #9 of 19 (permalink) Old 08-21-2010, 12:43 AM Thread Starter
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Re: Can't seem to purge air pocket

I'll probably be pulling it all apart again very soon.
Just is annoying seeing how not very long ago I just replaced it.
before I replaced it I flushed the system very well with vc9.
Its gonna get old very quickly if every 12k miles the oil cooler has to be replaced. This motor only had about 60k miles before the first cooler was replaced.
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post #10 of 19 (permalink) Old 08-24-2010, 12:21 AM
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Re: Can't seem to purge air pocket

My truck had 4 coolers replaced under the 100K warranty

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