I have this problem with my 89' 560SEL. The other day it stopped working! The day before it worked without a "cough". I already checked the fuse, it was fine. The service manual says to check the automatic temperature switch. It neglect to tell you how to remove it from it's place in the center console. I've located the blower motor, can I by pass the switch and test the blower "electrically" to see if it has power at the contacts?
TIA
Bill