Lets back up a bit. In the original post you stated that only the black/tan wire (high setting) has power even after moving switch to other positions. So the light blue, light green, and tan wires all have no power, correct? Just curious, have you tested your relays and fuses located in the power distribution center under hood?
The wires come from the switch, to the resistor. From resistor to motor. From motor to ignition, as you probably already know. If 3 of the 4 wires at the switch are not receiving power then problem should lie with the switch, the resistor or a relay. You said you replaced switch and resistor already, so fuses / relays need checked.
There are two circuits that power the blower motor. A relay switches between the two different circuits. The high speed circuit suplies battery voltage to the blower. When you set the blower speed switch to any other speed but high the current passes through the other circuit. The blower resistor is in this other circuit. Check the fuse that supplies power to this circuit, check the relay that switches back and forth between the two circuits.
Below are labeled components of the PDC. Sorry had to piece it together a bit so the bottom part is bigger than the rest, but it is in correct position.
Post results of inspecting fuses/relays and I will follow up.
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Sunday, January 11th, 2009 AT 5:31 PM