Hello, I have a 1987 US spec Merc. 190E, with electric heater controls. Ive owned it for roughly 6 years, It has always had its little issues but now the heater blower will just turn on full throttle while in the off position then turn back off, then turn back on then back off and so forth. It gets pretty annoying while driving down the road. Also It is stuck on hot. I can select cool on the dial but it never turns cool.

Could this all be linked to my push button control unit in the dash?

thanks to all that can point me in the right direction

David Lee Portland Or.
1987 300D
1987 190E 2.3
1984 230E Euro