GMC 1999 Sierra 1500 Pickup Owner's Manual page 325

When the engine compartment is hot, the level should be at the FULL
When the engine compartment is cool, the level should be at the FULL
mark.
COLD mark.
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+ -
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K2694
What to Add:
Refer to the Maintenance Schedule to determine what kind of fluid to use.
See "Recommended Fluids and Lubricants'' in the Index.
r
When adding power steering
fluid or making a complete
fluid change,
I
always use the proper fluid. Failure to use the proper fluid can cause
leaks and damage hoses and seals.
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