Caution – Hummer 2009 H2 User Manual

Page 384

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CAUTION:

You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol and
it will burn if the engine parts are hot enough. Do
not spill coolant on a hot engine.

1. Locate the coolant

surge tank pressure
cap that has this label.

2. You can remove the coolant surge tank pressure

cap when the cooling system, including the coolant
surge tank pressure cap and upper radiator hose,
are no longer hot. Turn the pressure cap slowly
counterclockwise about one full turn.

If you hear a hiss, wait for that to stop. A hiss
means there is still some pressure left.

3. Then keep turning the pressure cap slowly, and

remove it.

4. Fill the coolant surge tank with the proper mixture,

to the FULL COLD mark.

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