rbtharris

Thanks NVU. I went ahead and ordered a relay. Since I'm not getting power to the blower connector, I think that's the problem. Fuses are good. I don't want to go to the trouble of getting to the relay just to test it. It's 20 years old, so might as well replace it. This isn't a daily driver, so no rush to fix it. There were a lot of posts that stated that the power goes through the resistor, but that's not what the wiring diagram shows. It's also not the way the control on the ignition system works. Power to the coil is always hot. Control is via the ground side (crank sensor, computer, ignitor). It looks like the control of the fan works the same way. Power should go to the fan when the relay closes. Control works from settings of the switch and the resistor, which are on the ground side. If I'm reading the wiring diagram correctly. I could easily be wrong on this. I'd rather work on mechanical problems any day.

I don't know if there's another/more current thread on this, but I have an issue with the blower motor on my 1999 Subaru Outback. Steps I've taken so far to test.... I removed the blower motor/fan. Hooked it up directly to battery (power and ground) and it runs smoothly and at a high speed. I removed the control module from the dash and disconnected the 3 connector plugs. Checked the ground connection for each connector and those were all good. No signs of anything shorted or burned. Tested the ohms on the switch and it seems ok with sequentially lower values from hi, med hi, med hi, and lo. Removed the connector at the resistor. I tested it with an ohm meter and got the following resistance values at 200 ohm setting on my meter. 1.8 for Med Hi, 1.5 for medium low, and 0.6 for Lo. It seems to be ok, but I have no idea what the specs should be. Can't find them anywhere. There is no power to the plug to the fan motor with the ignition switch in the on position and the control switch in any position with everything reconnected except the plug to the blower motor. I have a wiring diagram in a Haynes manual. It looks like power is supplied to the motor via a relay and ground via the the resistor. If that's true, it appears that the relay must be bad since there is no power to the motor, and the switch and resistor seem to be ok. Thoughts from anyone? Thanks 99 hvac wiring.pdf