2006 / 2007 vnl hvac cab blower and controls

Hello, all of you gear-heads.

Here is my situation, I do not want to waste money for things that are not broken, my cab blower motor stopped working.


Here is what I've done: I've pulled the blower motor out and connected it to the 12v battery, directly, and it worked fine. So, I'm thinking that my blower motor is in working condition. Correct?

Now, I'm not to electrically savvy, so, here is what else I've done: there are 3 plugs on the blower motor assembly. One plug, two wires, connects to the motor itself. Another plug, bunch of wires, connects to what looks like the heat exchanger - shaped like half moon, and bolts to the motor housing with two torx screws. Third plug, looks like it connects to the "thermometer"?

Next, I've put the volt meter on the plug that connects to the motor, while the plug is connected to the motor. With all of the plugs connected my reading was zero Volts. If I'll unplug the motor plug, and still keep my multimeter leads on that plug, the reading will jump to 12V, depends on the speed that is on the fan setting. Voltage would fluctuate if I'll change the fan speed setting. If I'll plug the plug, from the wiring harness, back into the motor, the voltage would drop to zero volts. Also, if I'll unplug the plug with multiple wires, from the half moon shaped heat exchanger looking thingy, and keep the motor plug unplugged then the reading will drop from 12v to zero V. If I'll plug that plug, from the half moon looking thingy, back in, and keep to motor plug unplugged, then the voltage reading on the motor plug will jump up to 12 or so volts, dependent on the fan speed setting.

By the way, the blower fan and climate control in the bunk work fine. The above issue is in the CAB portion of the truck.


ANY IDEAS WHAT IS WRONG OR WHAT I NEED TO REPLACE?????