Hi db scoob, I had the same problem back in the summer,I found a small leak from a water pipe coming off the filler tank,It caused a lot of steam which looked like smoke and the burning smell was the antifreeze dripping onto the hot engine.I replaced the small hose and clips and all has been well.Dont use rad-weld it gums up the tiny waterways in the engine block.Its better to get the problem sorted properly.Good luck fixing it.CONROD