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{CAUTION:

Adding only plain water to your cooling

system can be dangerous. Plain water, or

some other liquid such as alcohol, can boil

before the proper coolant mixture will. Your

vehicle’s coolant warning system is set for the

proper coolant mixture. With plain water or the

wrong mixture, your engine could get too hot

but you would not get the overheat warning.

Your 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:

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.

If no coolant is visible in the surge tank, add coolant

as follows:

1. Park the vehicle on a level surface. 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 (left) about one-quarter turn and

then stop.

If you hear a hiss, wait for that to stop. A hiss

means there is still some pressure left.

5-36

Cadillac 2004 CTS User Manual

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