1995 heater switch

[OUS]

My 1995 850 Turbo Wagon periodically refuses to respond to my fan speed
requests. It may not work properly for days or it may revert to normal the
next time I start the car. Any ideas?

 

[Mr. V]

My 1995 850 Turbo Wagon periodically refuses to respond to my fan speed
requests.  It may not work properly for days or it may revert to normalthe
next time I start the car.  Any ideas?

http://www.swedishbricks.net/700900FAQ/HeatingAirConditioning1.html#Heating and Air Conditioning