Help with coolant ports on intake manifold. 2001 Chevy Silverado 4.3l vortec V6 90,000 miles.
Intake manifold has started leaking on the outer seal, in the front, and back of the manifold. so I decided to go ahead and do a full intake manifold gasket replacement with the Fel-Pro kit before it started leaking on the inside. I have zero water in my oil thankfully. This is what I saw when I got the manifold off. The coolant port on the right, “drivers side” was dry with corrosion covering the entire hole. Looking at the bottom of the intake manifold I see that the other coolant port, directly across from the corroded one is blocked off. Is it suppose to blocked off? And what would have caused the corrosion build up on the right side so badly? What’s the best way to flush out the junk, can I run water down that port and drain all the junk out through the water pump lower radiator hose connection?
Also, I thought TBI ended before 2001. Could be wrong but it makes me think previous owner put an older vortec v6 in this truck. Or at least on older EFI. Thanks for any help guys
ps: truck has no engine cooling issue. It has always stayed at 185 degrees after reaching it.