Just wanted to give a final report to wrap up this thread. After intermittent performance, I replaced the blower motor and squirrel cage assembly and the system runs like a champ once again.

My sincere thanks to Arthur for his spot on diagnosis. Without his suggestions I most likley would have changed out the blower regulator, tore apart the dash board and still had problems.

Even though I have all the discs and manuals for my 1990 300te, without this forum I could not continue to maintain this car myself.

Thanks again to Arthur and to all of you out there who take the time to help others.

Mark