I find that in the winter, my driver's side door rattles and creaks. Took a while to track down the source, but I've come the conclusion that it's plastic against plastic. Meaning the plastic part of the door rubbing against the plastic door sill. I tried vinyl conditioner, but in only worked for a few weeks. I've heard of people rubbing cross country ski wax on the offending surfaces as well.

If you do a search, you'll find this is a fairly common "issue" with the 126.