140 New kind of a/c blower problem

[Bzoo]

Hi everybody. It's summer time in Florida and my ac blower has an unusual characteristic. as the day gets hotter the blower blows slower and slower. First thing in the morning blows well ( but I'm not sure it blows full speed).

Have read every thread here and can not fine a conclusion. Any ideas?.
By the way 96 S320 106k miles. At regulator yellow wire 4 volts red wire about 11 volts. When I provide ground the blower kicks into super high gear. Do these numbers and symptoms make the regulator a conclusion or is the control unit still in question. By the way Steve I did read nine pages of posts on the subject. That is why I was wondering if anybody else had a conclusion given the info posted.

Thanks again