NOTE: Perform these steps at your own risk. All P/N's listed are a "best guess", so please double-check with your local dealer. These mods and repairs were performed on my US-Spec 1989 325i (12/88 prod date, M20/B25 engine) but there is no guarantee they will work on other E30's. These instructions are provided for entertainment purposes only!
If your internal ventilation fan slowly or abruptly stops working at lower settings, but speed 4 works fine, this is probably the fix. My resistor pack showed black spots from blown components, so I just replaced it while in there. Fixed it right up!
Ventilation only works in high (4)
If your ventilation only works in the high (4) position, here's the fix:
At the engine compartment, along the firewall, on the top, there's a rubber (?) cover that goes almost from side to side, that you'll have to take off, to gain access to the blower motor (4 6 mm bolts, 2 on each side). For easier access, take of the 2 plastic nuts, on the right, that hold some electrical wires together.
With the cover out, you'll see another (!) cover, round, held by two plastic straps. Loose them, and take off the round cover. (It's a bit tricky to take it off. It's only the top part, where the straps rest. Be carefull not to brake it).
Having removed this second cover, you'll see the blower motor. On its middle, at the bottom, look for a small brown plastic board with two "arms", one on each side, pointing down, and three resistors, (they look like springs). This board its held in place by its electrical connector, at the back. Just pull it in your direction.
This board is probably VERY dirty - mine was! Clean it thoroughly (the contacts on its back, the thermal switch on the middle, the resistors, everything!) with electrical contact cleaner, or WD40, and test it (Be carefull with the fan!) If it doesn't work, clean it again (I had to clean it twice), especially the thermal switch, below the three resistors.
If the cleaning doesn't help, one - or more - resistors, or the thermal switch are faulty. Test the resistors, using an Ohmmeter. The values are:
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