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

Engine Coolant Level Switch - 2500 Series


Object Number: 1608098  Size: FS
Master Electrical Component List
Cooling System Description and Operation
Control Module References
Engine Cooling Fans - 1500 Series
Power, Ground, DLC and Splice Pack SP205
G104 and G107
Figure 2:

Fan Controls - 1500 Series


Object Number: 1608100  Size: FS
Master Electrical Component List
Cooling System Description and Operation
Control Module References
Engine Coolant Level Switch - 2500 Series
B+ Bus - 1 of 2