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

Engine Cooling Fans


Object Number: 1637630  Size: FS
Master Electrical Component List
Cooling System Description and Operation
Control Module References
Engine Coolant Indicator
B+ Bussing
G106
Figure 2:

Engine Coolant Indicator


Object Number: 1637631  Size: FS
Master Electrical Component List
Cooling System Description and Operation
Control Module References
Engine Cooling Fans
Low Speed Serial Data
G109