Hi, newbie to this forum. Vehicle is; E320, 2000, 4 matic sedan, 60,000 mi.
The blower fan speed cuts in and out at speed settings from 1 to 5, it never stops completely but seems to vary in speed by itself both up and down. This happens in manual or auto mode. When set at speed level 6 or 7 (based on the number of LED's lit up) it does not appear to cut in and out in speed levels and stays at the set speed. I have searched this forum for clues to my problem but no luck so far.
I did the climate control test and did not get any errors so far.

Could this be my blower reg on it's way to failing?

will run at a constant speed on the two "high" settings makes me think that it is the controller itself as opposed to the regulator.