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Old 08-13-2013, 11:26 AM

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Where is the water going?

2006, 75000 miles. I just super flushed and added a coolant filter w/CAT ELC. Ever since I seem to be loosing coolant, but it is not "falling" out. It has been dry and there are no signs of it dripping, and dry frumunda (if you know what I mean). I pulled the EGR valve expecting to see it wet/damp in the lower chamber of the intake manifold, but it was dry. NASTY dirty, but dry.

I wondered if the block might still be burping up some air after the extensive flush (wish-full thinking). I hate the thought of a head gasket, but I guess it is possible. Is it possible for the EGR cooler to leak rearward? The old gal runs awesome and is not puffing grey or vapor.

I am new to this site and this is likely discussed here somewhere, I just have not found it yet. If there is more on this, could someone steer me toward it.
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Old 08-14-2013, 09:43 AM

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No one too quick to jump on this, but. I did hook a pressure gage to my return line on the gas-off tank. I was not towing anything, but it generally read 7psi and as I attempted to load it up on the highway (I pulled over and did a zero-90 going up a grade) the most I ever saw was just shy of 10 psi. If I stop and idle the pressure will drop below 5 psi. There is no coolant spraying out of the vent cap. Everything is dry, top and bottom. I park on the same paved spot all the time, ... nothing. There is no evidence of it shooting out only while driving, the bottom of the truck all the way back is clean and dry.

From the youtube videos, if it were a head gasket the pressure would quickly rise until the cap vents it at 16psi+/-. That did not happen.

Anyone want to chime in? Bueller, ... Bueller..... Anyone?
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Old 08-14-2013, 11:54 AM
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It is possible to be still working trapped air out. If your showing no visible signs of loss externally.
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