Besides replacing it, is there any way to make it quieter? It starts making noise after it has been on for about 30 minutes. Any suggestions.

If you are talking about the blower motor. You may try to lubricate it with a few drops of transmission fluid BUT, you have to get to it. Same job as you were to replace it. If you are NOT talking about the blower motor...NEVER MIND :^)

I had the same problem checked by a very reliable and knowledgeable mechanic. His explanation is that whistling that you hear comes from the motor ends (axes on both ends) spinning out of angle because the brushes (if I remember correctly) are worn out and, eventually, the motor will stop.
I am still using the same motor and the noise is on/off.
My car is a 300e -'86, 180k.
The choice is simple: to wait until it stops or do it now.
Regards,

Juan

I took the motor out and put some ATF on it. Works like a charm so far. Thanks.

Steve, I'm glad it work for you. Was that fun or what?

It was definitely worth it to save the $$$. lol