Do you know how to test electrical circuits ? Look at a wiring diagram an check power and grounds . Do you have a volt meter ? You can buy them cheap enough at a parts store . Here is a web site for free wiring diagrams http://www.bbbind.com/free_tsb.html
Enter your vehicle info. - Year , make , model and engine . Under system click on HVAC then under subsystem HVAC controls . Click the search button then the blue links one at a time . Looking at the first diagram do you see the IGN3 HVAC relay #59 located in the under hood fuse / relay box ? That's where the B+ power start's ,then blower fuse # 41 30 amp. check For B+ power on the brown wire at the blower motor you should see B+ voltage on the Orange wire as well with the blower switch in the off position .Do you see how the syatem works ,get's ground through the switch .Videos on youtube on basic automotive electrical testing . check them out ,how to use a volt meter . Learn to test an not guess
SOURCE: 7 wire harness going to blower motor resistor
There is an updated resistor/connector package. Very expensive from GM, try your local NAPA or other parts supplier for a replacement
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