I need to replace the combination fan(3 speed)/thermostat AC switch mounted on the dash to the left of the steering wheel of my 86 Westy Weekender.  I believe this was a dealer installed option and it is a diferent switch than the two switch combination used on the standard 86 vanagons.  According to the dealer and several list vendors, this part is no longer available.  Does any one have any ideas where I could get this part, or have any experience with other stock switch combinations that would work?

Bentley has no wiring diagram for the Westy dealer installed air conditioning.  Does anyone have these diagrams?  The wiring is different than the standard 86 vanagon  AC wiring but looks more like the 84-85 diagram.
 
Thank you. 
 
 
Juergen Panoscha

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