Fan runs at all times
If you click the high speed button, does it go in high?
(even though the off button is pushed in)
Does your A/C compressor engages by itself?
(even though the off button is pushed in or you have it in economy mode)
Do you hear a relay clicking on and off somewhere behind the cluster and the fan is supposed to be off?
If you have any or a combination of the above mentioned symptons try taking the CCU out and resoldering the contacts to the on/off switch. I did them all for safety, now it works like a charm
1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car