GTP coolant boiling?

Ok, after driving my 99 GTP for a little while and stopping (doing some shopping and coming back home), I hear this bubbling noise from the engine. I pop the hood and look to see that the coolant is boiling. :eek7: I am not real familiar with these engines, I have more experience with Honda/Acuras... but what could be the problem? The coolant gauge seems to be reporting ok temps, nothing to be extremely worried about. Any insights here appreciated,

Mario

how did you see it boiling? was it just letting air out into the resivour(sp?)?

I checked in the coolant res and the water was... bubbling.

I would bet it was just releasing air out of the system and releasing it into the res, like what happens when you pour a coke out of a 2 L.

it takes alot to boil anti freeze.well over the operating temp of the vehicle