My 1999 M3 convertible's climate control has started acting up. The display of temperatures set and fan speed will dim, then go out and it will turn off the fan. It seems to also turn on the rear window defogging fan. If I thump the dash next to it, that will sometimes get it to work again (the "bigger hammer" repair theory).
I've seen threads and web articles on replacing a capacitor inside the controller and I've got the tech skills to do that. Is that likely to solve the problem? The symptoms I've got don't seem to quite mesh with the ones shown for that solution.
Thanks!
Bob