AC fan switch

['69 2800cs]

Is there an existing thread that discusses options for the AC fan switch? Now that I have ice cold air, I'd like a variable speed switch.

Mine has super low, really low, then full blast as the only options. I've sprayed it with contact cleaner, lightly sanded the contacts with little improvement.

Ideas?

 

['69 2800cs]

How about a wiring diagram for the fan circuit? Fan, resistor, motor?

 

['69 2800cs]

Found what I needed here-

http://www.e9-driven.com/Public/Library/BMW-E9-Manual/pages/en/64500200.html#refertoc

Given I get full fan the resistor is the likely issue. Realoem lists this as 64511352023, discontinued.

64511363797 is the replacement. When I get back from vacation I will measure the resistor. If anyone knows the spec that would be helpful.

 

[Henrik]

Hi!
I have just replaced the original A/C fan switch with a ,new, non original one. It´s a tree speed switch witch give you low, medium and high speed.
I bought from Nostalgic Air Parts and it´s a resistor blower fan switch, Part #119-9910.

Attached is a modified wiring diagram. It´s important that there are no cables close to the resistors. They get hot.

Henrik

 

['69 2800cs]

Henrik-Thanks VERY much...that is exactly what I was looking for.

For the record, my resistor measures 2 ohms. I substituted a .3 ohm resistor (from a vintage Tamiya Sand Scorcher!) and I get exactly what I want-fan speeds in all ranges. Towards the top of the sweep I get about 80%, then the final click I get 100%. The switch gets hot, the resistor gets hot, it all seems OK but who knows long term.

I just ordered the switch!