88 E30 Air conditioning??

[E30spec15]

When ever I turn on my air conditioning fan on 1,2,3 it will not turn on but when I put it on 4 it will work. Any body know why it would do that??

[E36steven]

I have never worked on an E30 so I can't be sure but that's almost always a bad resistor in the unit that controls the blower. It might be behind the control panel or it might be on the blower mower itself.

[thejlevie]

That is probably a problem with the fan speed resistor. It and the blower are under the oblong cover in the center of the firewall in the engine bay.

[E30spec15]

Thanks guys for letting me know.

[MarcoZandrini]

Definitely the resister pack. The resistor pack is located on the blower body. Access is via the firewall on the engine side. There is an access panel there.