Service & Appearance Care; Engine Coolant - GMC 1999 Sierra 1500 Pickup Owner's Manual

Service & Appearance ,Care
Engine Coolant
r
PO593
The following explains your cooling system and how to add coolant when it is
low. If you have a problem with -engine overheating, see "Engine
Overheating" in the Index.
The proper coolant for your vehicle will:
Give freezing protection down to -34°F
(-37°C).
Give boiling protection up to 258°F (125°C).
Protect against rust and corrosion:
Help keep the proper engine temperature.
Let the warning lights and gages work as thiy should.
What to Use:
Use a ,mixture of
clean
water (preferably distilled), and antifreeze that meets
"GM Specification 6038-M," which won't damage aluminum parts. Also use
GM Engine Coolant Supplement (sealer) with a complete coolant change.
If
you use these, you don't need to add anything else.
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