Im loosing coolant somewhere but no sign of blown gask. 05 6.0 with an egr delete. Is it possible the egr cooler can still be leaking even with it welded shut? No residue on degas bottle, no white smoke, no sweet smell from exhaust, no visiual signs of a leak, no loss of power or noise. Could it be possible the water pump is out? Two week wait to even get my truck looked at, Saskatchewan sucks. Losing about half a 50/50 jug every 3 weeks. Any help would be great.

 

It could still leak, depending on who welded it up I guess. Could still be headgaskets too. No noticeable leaks from the front cover or anything? Have you checked the underside of the degas bottle? Sometimes they crack and leak slowly under pressure. Maybe try pressurizing the coolant system and see if you see it leak out anywhere.

 

Ya I cant find nothin. Had a mechanic at Impact Diesel Performance look at it and he thinks water pump.

 

I'm trying to figure out how the water pump failing would cause coolant to disappear? A leak this small would take a while to pool up anywhere, you sure it's not leaking anywhere else? Have you crawled under the truck? I had mine randomly spring a leak once because one of the spring clamps they use on the coolant hose finally just weakened to the point it couldn't hold under pressure anymore. When the truck would sit and idle in the driveway, nothing... take off down the road and get pressure built into the coolant system and it's leak out like crazy on the big hose coming off the front cover.