2006 Freightliner Columbia - dash blower motor not working

You have a blend door system. You will have 4 wires at the blower motor 2 big wires and 2 small wires. The 2 big ones are the power and ground. Get some sort of a load like a headlight and run it off of the 2 big wires. If it burns bright then you have good power and ground. Next the 2 small wires. One is a signal to the motor and the other is a feed back. one of the small wires will have 0v when the switch is off and about 6v with the switch on high. The other wire you could ohm from the motor to the control head. Last, get the proper male terminals and do a "drag test" on the terminals at the blower motor connector. They are bad about getting spread and all of the tests will be good but the female terminals of the connector will not make good contact with the male terminals of the blower motor. You have probably hear the term "throwing a hotdog down a hallway" So don't just get a test light and shove in the terminals for your tests. You will mess up more than you will fix.

 

Will I be able to see the motor if I remove the front dash panel where the switches are located?

 

some freightliner got brushless motors and usually ESC board fails

 

No the motor is above where the passenger feet would be. I thank the control wire operates at about 0-6 volts and the return wire about half that. If the return is way off from that the motor is bad.
Is the ESC board in the bottom of the motor or the switch panel?

 

board is bolted on motor.

 

And stands for?

 

new motor supplied with board