What is the function of a diode in hot water shut off solenoid?
I am in a process of fitting a/c in to my E30 M10 316 (without factory a/c). I have just fitted complete box (with heater and evaporator).
While components testing I must have reversed the polarity, and burned the diode. I replaced it and shut off valve works. But it works without diode too. Only with burned diode will the fuse burn.
And is it some special diode? I fitted one that was probably from a broken old TV.
Another question. Looking at a wiring diagram I noticed "a/c comp oil temp switch". I do not have that. Do I miss this component, or I have a/c set from different year.
And there is also a diode at compressor clutch. Is this diode function the same as function of the one at a hot water shut off solenoid?