Originally Posted By: 01rangerxl
Originally Posted By: 901Memphis
Originally Posted By: 01rangerxl
That's the coolant outlet/water neck.
Buy a new overflow hose and outlet. I usually keep 3 of each in stock. People who just buy one always come back for the other. The new outlet comes with seal, bolts, and sensor. It's not that expensive, but I can't remember the current price off the top of my head. The whole job should be less than $100 in parts and coolant though.
I don't see any of those parts at Rockauto. You said coolant? I thought it looks like an oil line, I seen oil or some dark fluid come out of it when I messed with it.
Yes, that part is a coolant outlet. They don't sell the plastic fitting the hose connects to by itself, even though you can remove it from the outlet. The current GM part # for the outlet is 25193922 and list is $44.11. It has changed numbers a bunch of times.
It is listed on Rock Auto under "Thermostat Housing/Water Outlet"...
http://www.rockauto.com/en/moreinfo.php?pk=6755172&cc=1501801&jsn=438
The outlet doesn't house the thermostat, that's on the other side of the engine on the water pump, it's just listed in the same section of the catalog.
For whatever reason Rock Auto doesn't list the hose, but the part number on it is 13251447. GM list is $19.94.
Pretty much any Chevy dealer should have both in stock.
Got one off eBay and plan to change at 100k here shortly just as PM …