I need suggestions: This 1990 300E.When I press any of climate control button, there is no air coming out, either set it hot or cold. This is my second time that it happens. The first one was 3 years ago. I took to the dealer, the mech. said it was a blower switch. It cost a lot. Can someone tell me where it is located and what it looks like. I took everything apart yesterday cannot find fuse or any switch.