Have any of you ran into cooling problems like over heating?

No real problems yet. Although, my radiator cap began to leak (after almost 70k miles) and boosting ~15 psi daily. The underhood temp, in general, will be a lot hotter.

Only after the spark plug re-decorated my combustion chamber. :( I was running 20psi on pump gas and it never even got close to overheating. Same is true now - so far.

Yes, as most of you know I've been having overheating problems. I've replaced my radiator cap, thermostat, both radiator hoses, and even pulled the radiator out of the car and flushed the shit out of it. I think my headgasket is warped near one of the coolant passages and is leaking hot pressurized air into my coolant system. Do a compression test, and like I said before, check to see if you piss out antifreeze from your overflow after you boost it hard(I mean boost it HARD). Thats what happens to me, all that pressure gets into my coolant system(from the gasket leak) so it has to blow out somewhere. Once I blow a bunch out, I then overheat from the lack of antifreeze. I ordered a Fluidyne and it should should be here within the next couple days, but I doubt thats my problem anymore :(

Not yet...

I have a 98 gs-t and notice after boosting hard I leak coolant from the upper radiator hose.

I tightened the hose and since it has gone away.

Makes sense though, harder driving calls for more wear and tear.

http://www.2gnt.com/dcforum/DCForumID13/6283.html

problem solved!!!!!!

I would always do a compression test if your having probs overheating... cause it seems like most of the time its a leaky head gasket.