amowry

Okay, here's what I finally did: I left the relay in place, and put a switch between pin 3 and ground. That way it still uses the relay to turn the fan on and off, and the power for the relay coil still comes from pin 1, which switches off when the ignition is off. It works well enough to eek a few more years out of this car without having to fork over the $$ for a new mode control. Thanks everyone for all your help.

Never mind, I found the fuse. Back to square one...

Okay, I'm in over my head. I blew the fuse on the mode control. Any idea where that's located?

Well, I realized that the power to pin 2 isn't switched with the ignition, so I guess I'm back to square one. Any idea if there's power under there nearby that I can tap into that's switched?

Sorry, I was wrong-- I should have said that connecting pins 1 and 4 cause the fan to come on. I just realized that connecting 2 and 4 also make it come on. I'm assuming this would be a better place to put a switch, since these are the relay contacts, correct?

I may have answered my own question-- connecting pins 1 and 3 turns the fan on, and the speed selector slider still controls the speed. Is there anything wrong with adding a switch between pins 1 and 3 (other than it being a hack job, which I concede that it is)?

There is power from pin 1 to ground. Darn, I was hoping it would be anything but the control module. Next question (thanks for all your help by the way!): Is there anything wrong with just putting a switch in to turn the fan on and off, bypassing the control module and relay? This car is on its last legs and I'm hesitant to put much money in it, but it's pretty much useless without defrost and heat. Could such a switch tap into the relay connector?

Okay, the fan is not working and pins 2 and 4 have power across them, but 1 and 3 do not. It's the same whether or not the fan is turned on. Unfortunately I've been rapping on the dash for a good year now, to no avail

Thanks! Yes, when it stops it stops completely. None of the speeds work. Is it it correct to assume that if it were the resistor the highest speed would still work?

I have a '90 Legacy wagon. The heater fan usually works when the car is cold, but it stops after it is warm, usually about 20 minutes after I start the car. I pulled the harness off the blower, and it does not get power, so I don't think the blower is the problem. I also replaced the relay, so that's not it either. Any other ides? Thanks!