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Discussion Starter · #1 ·
Happy new year everyone. It’s gonna be wild.
Just did an oil change last month and ran out of time to post this coolant issue. My last 2 oil changes, the coolant expansion bottle has been below the minimum line. The first oil change i filled it up to top line and closed the hood….when I opened up for this one, I noticed it was back down….so it was the first item I addressed at this the second oil change…by the time my son and I had finished the oil change process (15 minutes) the coolant level was back down!!! What the ****!

nothing running out the bottom of the truck. Only thing I can add is that it was low after I had the EGR recall a year ago…I figured the tech didn’t fill it up properly after doing the work since they have to drain the whole system?

the picture is attached from today. Look forward to replies on this topic
Hood Automotive lighting Automotive tire Fluid Vehicle
 

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Since you aren't seeing coolant on the ground, I would be looking at a leaking EGR cooler. That coolant ends up in the combustion chamber so take it seriously. If you can access both the inlet and outlet coolant lines for the cooler, you can pressure test it as a stand-alone component.
 

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Discussion Starter · #3 ·
Thank you #beaker I will check that out

The loss is not increasing as far as I can tell. It seems stable to this point.
 

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@FUGAZI - They don't have to drain the entire coolant system when performing 18E02 or 20E04, but some coolant is lost = more like topping off whatever is lost after removing the EGR By-pass valve assembly. Looking for an RO that had the exact amount of coolant required to be added back...

This "might" explain the first observed coolant loss, but where did the coolant go on the 2nd refill during the oil change???

BTW - did you change the fuel filter(s) while you had the hood open? Inquiring minds want new pics....
 

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Discussion Starter · #5 ·
@jmperlik thanks for the reply

I just got the replacement fuel filter in hand. So will be following up at my next oil change in a few months.

I don’t know but it is alarming…the strange part is the low level is constant…it’s not continuing to drain.
I have used about a third of a large bottle of coolant so it’s a significant amount…..

could this be some sort of “vapor lock” from the service where it is only filling up when the gravity/head pressure hits a certain point…
 

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Discussion Starter · #7 ·
Not sure if my video will come thru but there is a ton of air in the main cooling line off the radiator.….just needs more fluid. When the tech finished at the recall, they filled up the reservoir and walked away….the EGR is the low point and acts like a check valve of sorts I guess. Will go top it off
 
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