Hummer 2009 H2 User Manual download pdf (Page 386)

100

101

What Kind of Coolant to Use

Use a mixture of one-half clean, drinkable water and

one-half DEX-COOL

coolant which will not damage

aluminum parts. If you use this coolant mixture, you do

not need to add anything else.

{ CAUTION:

Adding only plain water to the cooling system can

be dangerous. Plain water, or some other liquid

such as alcohol, can boil before the proper coolant

mixture will. The vehicle’s coolant warning system

is set for the proper coolant mixture. With plain

water or the wrong mixture, the engine could get

too hot but would not get the overheat warning.

The engine could catch ﬁre and you or others

could be burned. Use a 50/50 mixture of clean,

drinkable water and DEX-COOL

coolant.

Notice: If an improper coolant mixture is used, the

engine could overheat and be badly damaged. The

repair cost would not be covered by the vehicle

warranty. Too much water in the mixture can freeze

and crack the engine, radiator, heater core, and other

parts.

If you have to add coolant more than four times a year,

have your dealer/retailer check the cooling system.

Notice: If extra inhibitors and/or additives are used

in the vehicle’s cooling system, the vehicle could

be damaged. Use only the proper mixture of

the engine coolant listed in this manual for the

cooling system. See Recommended Fluids and

Lubricants on page 6-13 for more information.

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Hummer 2009 H2 User Manual Page 386

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