Gmc 2007 Sierra User Manual download pdf (Page 502)

How to Check and Add Fluid

The proper ﬂuid should be added if the level does

not reach the bottom of the diaphragm when it

is in place in the reservoir. See the instructions on

the reservoir cap.

Engine Coolant

The cooling system in your vehicle is ﬁlled with

DEX-COOL

®

engine coolant. This coolant is

designed to remain in your vehicle for ﬁve years

or 150,000 miles (240 000 km), whichever

occurs ﬁrst, if you add only DEX-COOL

®

extended life coolant.

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 on page 505.

A 50/50 mixture of clean, drinkable water and

DEX-COOL

®

coolant will:

• Give freezing protection down

to −34°F (−37°C).

• Give boiling protection up to 265°F (129°C).

• Protect against rust and corrosion.

• Help keep the proper engine temperature.

• Let the warning lights and gages work as they

should.

Notice: Using coolant other than DEX-COOL

®

may cause premature engine, heater core,

or radiator corrosion. In addition, the engine

coolant may require changing sooner, at

the ﬁrst maintenance service after each

30,000 miles (50 000 km) or 24 months,

whichever occurs ﬁrst. Any repairs would not

be covered by your warranty. Always use

DEX-COOL

®

(silicate-free) coolant in your

vehicle.

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