Help: Coolant from the backside of the block NEED ADVICE or input

James Hess

New member
Jun 9, 2008
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Tucson AZ.
There is coolant coming from the backside of the engine block above or around the transmission. I am not sure where it is comeing from but i am thinking a freeze plug but at the same time i am hoping its not.

It is an LLY truck so the Turbo is also water cooled do you think a fitting or a seal came loose, or is it what i am thinking and a freeze plug pushed out(which i doubt cause i have all coolant and no water of course thats mnot the best mixture but oh well also it hasnt gotten cold enough to freeze and push it out) or it just came loose and was pushed out by the coolant flow.

Any and all advice will be appreciated as i have never delt with this type of problem before and i could use all the help i can get. I would like to purchase one of those chilton manuals but i have to order it cause noone carries one for that particular year and truck. PLEASE help i need the truck up and running ASAP as for now its my daily driver.

Where i bought the truck from was Throughbread nissan in Tucson and i am not sure if they have delt with GM vehicles before but if so their techs are idiots. After i had the truck for a while i noticed it had the GREEN coolant and not the Dex-Cool. When i noticed that i tried to flush what i could from the system but some was still in there, do yall think a seal could have corroded and thats my problem but what all back there or in that area would use a seal and is there anything but the turbo that is also water cooled?

Also i have 102k on the clock so i just missed out on the 100k waranty on the dmax from GM so thats out of the question and if its possible i will be doing this work myself to fix it as i choose not to get raped by someone who charges to much or take it to someone who doesnt know what their doing and they jack something else up. If i have to take it somewhere i will but i could also use suggestions on that as to where is the best price for the best work kind of thing.
 
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James Hess

New member
Jun 9, 2008
45
0
0
40
Tucson AZ.
It is actually coming from the driver side and its a pretty strong drip, it left a couple of small puddles in the driveway lol.
 

LBZ

Super Moderator
Staff member
Jul 2, 2007
9,906
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B.C.
Check around the thermostat housing-it could be leaking into the valley and then running down that side. Or it could be the egr is leaking, collecting in the valley and then also running down that side.
 

White Duramax

Member
Jun 25, 2008
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ohio
Check the coolant lines running to the turbo and ones on the egr cooler. I had a turbo coolant line leaking and you really couldn't tell where it was coming from till I took the intake off and pressurized the cooling system to see where it was dripping from.
 

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
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Texas!!!
Could be where the coolant comes out of the oil cooler and goes into the flywheel housing. There's a small cast elbow that has a molded rubber seal and a metal gasket. I had a leak there when I put my engine back together the first time. It's pretty easy to see it right next to the oil filter.