Aux fan operation

[Ceeker]

I recently rebuilt my a/c system; rebuilt compressor, dryer, condenser. I tested the aux fan by jumping it, and both speeds work. when I press the a/c switch on I get no fan. Does the aux fan come on when the system is NOT charged? the blue light also doesn't illuminate.

thanks.

[jlevie]

If the snowflake button doesn't light when the button is in, the switch could be bad, the switch on the slider could be bad, the fuse blown, or there could be a wiring fault. Well I guess that the bulb in the switch could be burned out. But in most cases it will be an electrical problem and the aux fan isn't going to run.

I can't remember if all of the sliders have a switch, but I know the middle one does.

[Ceeker]

it was working before I rebuilt the system. I changed the switch and the bulbs just to see maybe it was burnt out. No deal. double checked the fuses. they seem fine.

as the a/c button and fan was on high I went to see if power was going to the low and high fuse and the light tester didn't come on.

[jlevie]

Get the wiring diagrams from http://wedophones.com/BMWManualsLead.htm. Find where power is supplied to the HVAC controls and follow that to find the fault.

[Ceeker]

well, for the life of me I never realized the middle slider on the heater control activated the a/c switch to illuminate and to turn the aux fan on...When i pushed it passed mid point the light switch turned on. thanks for everyone's input.

[jeffnhiscars]

well, for the life of me I never realized the middle slider on the heater control activated the a/c switch to illuminate and to turn the aux fan on...When i pushed it passed mid point the light switch turned on. thanks for everyone's input.

Its amazing how many people are not aware of the slider function when I believe its actually in the owners manual (not like everyone has one, but still).

I just hope you didnt rebuild your AC system only to find out it was the slider :-)

[Ceeker]

Its amazing how many people are not aware of the slider function when I believe its actually in the owners manual (not like everyone has one, but still).

I just hope you didnt rebuild your AC system only to find out it was the slider :-)

yeah, I've like had 14 of these cars and I'm like DUH!! but not all of them have this function. my 325is works as soon as I push in the a/c button.

I've been restoring my car so the a/c was pooched before I did the work. My system was contaminated with black death so I just got new stuff. didn't cost me much for the parts. maybe 250-300 in total for powder coating and new bottle and condenser, oil, and seal kit for the comp. :-)

[jeffnhiscars]

yeah, I've like had 14 of these cars and I'm like DUH!! but not all of them have this function. my 325is works as soon as I push in the a/c button.

I've been restoring my car so the a/c was pooched before I did the work. My system was contaminated with black death so I just got new stuff. didn't cost me much for the parts. maybe 250-300 in total for powder coating and new bottle and condenser, oil, and seal kit for the comp. :-)

We get black death here, but I think you guys get black death ehh, for sure !! :)

What part of your ac system did you powder coat