Originally Posted by 4-G-Rim
Welcome to TGC... I agree with 4-G-rim, could be a head gasket issue. If you're blowing out white smoke and it's a head gasket issue, you've got a leak between a coolant passage and the combustion chamber. So, do a compression test and you'll know this is the case if you get a pretty low reading on one or more cylinders (below 100 PSI). If you've got two cylinders next to each other that are low, the gasket probably blew between those two cylinders.
Have you had any problems with overheating?