About a month ago my 2005 GTO was overheating because of a hole in my radiator. So i put in a new radiator,and thermostat and reservoir cap. I checked all the hoses and none were leaking. So yesterday im on the freeway and the thing starts to heat up again.There is some smoke coming out of the front so I pulled over and turned it off. Looked under the car for a leak and nothing came out. I waited ten minutes turned it on and looked for a leak again. nothing. I looked in the reservoir and it was full.i checked all the hoses, they were fine. Only thing i can think of is possibly the water pump, but theres no leak on the pump so i figure its fine. At the same time this happened my pulley belt starts having some crazy squeel. I dont know if they are even correlated, but im taking it to the shop today, and want to see if its something i could fix, or need some major work. hopefully its minor. any ideas would be appreciated so i can haggle the price with the mechanic. thanks.