A/C blower motor problems

[bmartinezx3]

hello i recently bought a 2003 trailblazer ltz with automatic climate control (Digital)

since i got it the a/c didn't blow at any speed.

i changed the blower motor and still dosnt work, i used a circuit tester to test the connections to the blower motor and it has a current through it. why dosnt it turn on? if the resistor had blown would there still be a current going through the connection?

 

[DAlastDON]

Blower speed with the automatic climate control is achieved via pulse width modulation. No resistor pack. You have voltage getting there but do you have a ground as well? If not then check for a ground at the blower control module. If that is good then check the ground wire from blower control module to motor. If that is good then check continuity between the blower control module and HVAC control module. If that is good then i would point my finger at the HVAC control module.

http://gmtnation.com/forums/topic/361-need-service-manuals-get-them-here/

 

[freddyboy61]

Usually it is the Blower Motor Control Module.