Saturn 2009 VUE Green Line Hybrid Owner's Manual page 239

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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 you 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
Notice: In cold weather, water
can freeze and crack the engine,
radiator, heater core and other
parts. Use the recommended
coolant and the proper coolant
mixture.
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.
coolant.
Service and Appearance Care
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CAUTION
1. You can remove the coolant
surge tank pressure cap
when the cooling system,
including the coolant surge tank
pressure cap and upper
radiator hose, is no longer hot.
Turn the pressure cap slowly
counterclockwise about
one-quarter of a turn. If you hear
a hiss, wait for that to stop.
This will allow any pressure still
left to be vented out the
discharge hose.
2. Then keep turning the pressure
cap slowly, and remove it.
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