Hey everyone. Crossposting this with a couple other forums.
I usually work on Japanese cars, so I'm hoping someone can help me out here. I inspected a 1998 Tahoe with the 5.7L Vortec engine. On this engine, there's a hole above the oil filter. I'm gonna be honest, I have very little idea what this hole is for, but what I DO know is that there's an enormous amount of coolant leaking from it.
Whenever coolant is poured into the radiator, it takes a moment to settle, and then pours out of this hole. Never in my life have I seen anything like this.
I was upfront with the owner and told them that I was stumped and literally couldn't imagine where that coolant was coming from, and we might wanna find someone who knows GM engines a bit better than I do.
I can't think of anything other than a cracked engine block, but I also didn't wanna give it a death sentence without actually confirming what's happening first. I couldn't fine any lines that ran anywhere that could lead to this hole, and I couldn't imagine how you'd even begin to fix an issue like this. without taking the engine apart I looked at the schematics and couldn't figure out where the coolant could be coming from.
I told the owner that whatever it was, it probably wasn't gonna be a quick fix, and that'd I'd try to do more research to see if I can figure out what's going on without having to take the whole engine apart. Maybe I should finally buy a borescope.

Anyways, if anyone has any idea what the hell is going on here, that'd be much appreciated.

Here's a video of it:


Thanks!

 

Pretty sure that's leaking around a bad freeze plug