GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Blower Motor, HVAC Controller Front


Object Number: 449917  Size: FS
Figure 2:

HVAC Control Module, Blower Motor (Rear) Suburban/Yukon XL


Object Number: 449924  Size: FS
Figure 3:

HVAC Control Module, Blower Motor (Rear) Tahoe/Yukon


Object Number: 449931  Size: FS