GMC 2009 Acadia - Manual (Page 308)

How to Add Coolant to the
Radiator
{ CAUTION
An electric engine cooling fan
under the hood can start up even
when the engine is not running
and can cause injury. Keep
hands, clothing, and tools away
from any underhood electric fan.
{ 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 surge tank pressure
cap — even a little — they can
come out at high speed. Never turn
the cap when the cooling system,
including the surge tank
(Continued)
CAUTION (Continued)
pressure cap, is hot. Wait for the
cooling system and surge tank
pressure cap to cool if you ever
have to turn the pressure cap.
If coolant is needed, add the proper
mixture directly to the radiator,
but be sure the cooling system is
cool before this is done.
1. Detach fasteners and lift off
the panel that covers the
radiator cap.
2. Remove the radiator pressure
cap when the cooling system,
including the upper radiator hose,
is 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 in the
system.
3. Keep turning the pressure cap
slowly and remove it.
4. Fill the radiator to the base of
the filler neck with the proper
DEX-COOL coolant mixture.
5. When coolant begins to flow out
of the filler neck, reinstall the
pressure cap. Be sure to secure
it tightly.
5-22 Service and Appearance Care