Thanks to everyone for the ideas, I'm new to this forum stuff but it is a great way to exchange info. I have a 91' 300SL and I am having the exact same problems The blower has never work I'll owned this one for about a year. I also had similar problems with a 86' 420 SEL that I previously owned. You can feel the temp changes at the vent but the fan won't blow. I did check the fuse but the one that I saw in the forum doesn't look like anything that I saw in my fuse box unless it's in the trunk box! I will check there as well. How long does it take to get to the blower motor and regulator on this vehicle? Thanks again to everyone for the info, I will periodically check forum to see if there is any usefull info that I can provide.