The heat on my 145 wagon has sropped working. One day it rocked the next it stopped. Plus the temp. gague, which was always a little funky, is ridding really high, it's all the way up. It gets hot very quickly. I checked the radiator collant in the resevoir thinking that ther wasn't proper fuild cooling off the engine and circulating to bring me heat. The resevoir was empty and I topped it off. But it didn't take much fluid. But the problems persists, along with white smoke after only several minutes of driving. So any thoughts on what to check. It's way cold up here, and heat would be nice.

thanks