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

Blower Controls


Object Number: 687403  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Compressor Controls
Instrument Panel Electrical Center Fuses 50, 14, 21, 22, 18, Relay 44, and the Ignition Switch (2 of 2)
G202
Figure 2:

Compressor Controls


Object Number: 687407  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Air Delivery/Temperature Controls
Blower Controls
Underhood Electrical Center Fuses 14, 13, 16, 15, 5 and Relays 43,44, 35 and 42
G106 and G105
Underhood Electrical Center Bussing (2 of 2)
G101 and G102
Figure 3:

Air Delivery/Temperature Controls


Object Number: 687411  Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Air Delivery/Temperature Controls (Vacuum Routing)
Compressor Controls
Instrument Panel Electrical Center Bussing (1 of 2)
G202
G201
G201
Figure 4:

Air Delivery/Temperature Controls - Vacuum Routing


Object Number: 687415  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Air Delivery/Temperature Controls