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Old 11-09-2012, 01:51 PM
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Coolant Flush - Low/High fluid level

Need a little help here, not sure if I have a problem or not with the coolant level.

I did a coolant flush last week, switched from Ford to Fleetrite brand, did the complete flush and took about 8 hrs to complete.

I had to get a new degas bottle, mine had a hole in the bottom, (150K on the truck), so I added coolant/distilled water to the bottom fill line as suggested.

When I drive the truck the coolant is then low, almost not visible in the degas bottle, when I shut the truck down it fills up with coolant up to the full mark.

Do I have an issue with the cooling system or is this normal? Thanks
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Old 04-05-2013, 08:38 AM
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I thought I would post an update if anyone else is having the same problem.

When I drive the truck the coolant goes to low, almost not visible in the degas bottle, when I shut the truck down it fills up with coolant up to the full mark and makes a gurgling sound while it all dumps back into the degas bottle.

About 2 months after this original post my EGR went out, I had it deleted and a new oil cooler installed, the coolant now stays in the degas bottle while driving so I assume it was clogged up someplace which caused it to leave the bottle and then fill back up once the truck was shut off.
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Old 04-05-2013, 03:11 PM
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sounds like you didn`t get all the air out of the system. Try taking cap off open defrosters and run truck till thermo opens run for 10 or 15 mins, you may have done that already though.
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Old 04-07-2013, 02:53 AM
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Do a check for exhaust gas in your coolant.
Could be leaking head gaskets.
My degas behaved exactly as you're describing,
and after the head gaskets were changed the level
would increase when hot, and decrease when cooled
down.
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