Chevrolet Silverado 4500HD 2022 Manual page 280

The cooling system in the vehicle is filled
with DEX-COOL engine coolant mixture.
See Recommended Fluids and Lubricants
0 363 and
Maintenance Schedule 0 330.
The following explains the cooling system
and how to add coolant when it is low.
If there is a problem with engine
overheating, see Engine Overheating 0 281.
A 50/50 mixture of clean, drinkable water
and DEX-COOL coolant will:
Give freezing protection down to 37 °C
( 34 °F).
Give boiling protection up to 129 °C
(265 °F).
Protect against rust and corrosion.
Help keep the proper engine temperature.
Let the warning lights and gauges work
as they should.
What to Use
Use a 50/50 mixture of clean, drinkable
water and DEX-COOL coolant which will not
damage aluminum parts. If using this
mixture, nothing else needs to be added.
If coolant has to be added more than four
times a year, have your dealer check the
vehicle cooling system.
Caution
Do not use anything other than a mix of
DEX-COOL coolant that meets GM
Standard GMW3420 and clean, drinkable
water. Anything else can cause damage
to the engine cooling system and the
vehicle, which would not be covered by
the vehicle warranty.
Never dispose of engine coolant by putting
it in the trash, or by pouring it on the
ground or into sewers, streams, or bodies of
water. Have the coolant changed by an
authorized service center, familiar with legal
requirements regarding used coolant
disposal. This will help protect the
environment and your health.
Checking Coolant
The coolant surge tank is in the engine
compartment on the passenger side of the
vehicle. See Engine Compartment Overview
0 272 for location.
Vehicle Care
The coolant surge tank is divided into two
sides. The upper portion coolant level should
be at or above, the bottom of the indicator
arrows. The coolant level must be checked
when the engine is cold and the vehicle
must be on a level surface.
The lower portion will be mostly empty,
depending on the operating temperature.
Warning
Turning the surge tank pressure cap
when the engine and radiator are hot can
allow steam and scalding liquids to blow
out and burn you badly. Never turn the
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