PLEASE HELP serious climate control issues 1994 325is!!!!!!!!

[kevinl34]

Ok so I have change the climate control like 3 times already thinking it was the unit itself and all three times the samething happen her we go: When I turn on the the lights with the fog lights on the unit will work flawless while idleing on setting (4)full blast and 3 of the control unit. But when I turn just the fog lights on it will work on setting (4)full blast but on setting 3 it will work for a while then shut off. I have also notice while driving and the control unit working on setting (4)full blast with a/c the light tend to flicker sometime like something is pulling power from them for a moment. so heres my problem any suggestion. could it be the wiring harness were can I get this checked out because it seems something is crossed up. thanks for any help!