rear air problem

[chaileyk5]

I'm looking to buy a 2000 tahoe with 118k. its in pretty good shape, but the rear air only works on high. anybody have any ideas?

 

[JKmotorsports]

Blower motors usually use resistors to regulate the voltage to the blower motors to control speed. Resistors get hot, and can sometimes burn up and cause an open circuit. On the high setting, there is no resistor, which is usually why the high speed setting works and the lower speeds do not. Simple fix. If the rest of the truck is in great condition and the price is right, I wouldn't let this sway your decision much.

 

[chaileyk5]

do you know where the resistor is located, and what would be involved in fixing it? thanks