Pontiac Grand Prix 2007 Owner's Manual page 375

If you have not found a problem yet, but the
coolant level is not at the cold fill line, add a
50/50 mixture of clean, drinkable water and
®
DEX-COOL engine coolant at the coolant
recovery tank. See Engine Coolant on page 366
for more information.
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.
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.
When the coolant level in the coolant recovery
tank is at the cold fill line, start the vehicle.
If the overheat warning continues, there is one
more thing you can try. You can add the proper
coolant mixture directly to the radiator, but be sure
the system is cool before you do it.
CAUTION:
{
Steam and scalding liquids from a hot
cooling system can blow out and burn
you badly. They are under pressure, and
if you turn the pressure cap — even a
little — they can come out at high speed.
Never turn the cap when the cooling
system, including the pressure cap, is hot.
Wait for the cooling system and pressure
cap to cool if you ever have to turn the
pressure cap.
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