Regarding your blower fan not turning off, try a hard bang on the side of the console near the climate control. I think the relay for the fan gets stuck closed. Probably from a fan drawing too much current and fusing the contacts.

Worked for me.

__________________
1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"

I have the 240D manual climate control with the large center switch for the blower fan. I don't think that's the same as you are describing if your referring to one of the cars in your sig?

- Peter.

__________________
2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S