This is on a 90 Legacy I picked up as a winter car. The previos owner had this problem with it and wired up a switch directly to the fan motor so I know the fan motor works. I picked up another heat/Ac control setup and installed it last night to find what I think is not the problem. After checking with a probe I find there is no power coming to the switch itself. Fuses are all good. What am I missing????? Any simple solutions??

[...]What am I missing????? Any simple solutions??

Go to this page:

http://www.autozone.com/servlet/UiBroker?ForwardPage=az/cds/en_us/0900823d/80/1c/6c/ea/0900823d801c6cea.jsp

Click on fig. 44 . The wiring diagram will show you that the switch controls the ground end of the motor circuit (and the grounding of the blower relay coil). The hot end is switched by the blower motor relay. Either the relay is bad, the grn/blk wire isn't getting grounded, or there is a wiring problem to/from the relay. (This assumes that no new problems were introduced by the installation of the new "control setup".)

Seeing the diagram, I'm thinking it is the relay. I'm going to see my favorite parts car after work and grab the one that is in it. There is a legacy 4 door not far from that one also. Might as well get that one too.

Well I got three relays from the junkyard, and the good thing is that they all WORK!!!!! The heater fan now comes on at all speeds. Now forthe next problem. See the next post for that one.