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

Primary Blower and Air Delivery Controls C42 and Vacuum Pump
Object Number: 2080578 Size: FS
Figure 2:

Compressor Controls C60
Object Number: 2080580 Size: FS
Figure 3:

Rear HVAC with Rear Auxiliary Controls (1 of 3) C69
Object Number: 2080581 Size: FS
Figure 4:

Rear HVAC with Rear Auxiliary Controls (2 of 3) C69
Object Number: 2080583 Size: FS
Figure 5:

Rear HVAC with Rear Auxiliary Controls (3 of 3) C69
Object Number: 2080584 Size: FS
Figure 6:

Rear HVAC without Rear Auxiliary Controls (1 of 2) C69
Object Number: 2080586 Size: FS
Figure 7:

Rear HVAC without Rear Auxiliary Controls (2 of 2) C69
Object Number: 2080828 Size: FS
Figure 8:

Rear HVAC C36 without C69
Object Number: 2080829 Size: FS
Figure 9:

Coolant Heater (K08)
Object Number: 2080831 Size: FS