Buick 2009 Lucerne - Manual (Page 313)

Checking Coolant
The vehicle must be on a level surface when checking
the coolant level.
Check to see if coolant is visible in the coolant recovery
tank. If the coolant inside the coolant recovery tank
is boiling, do not do anything else until it cools down.
If coolant is visible but the coolant level is not at or above
the FULL COLD mark, add a 50/50 mixture of clean,
drinkable water and DEX-COOL
® coolant at the coolant
recovery tank, but be sure the cooling system is cool
before this is done. See Engine Coolant (4.6L Engine) on
page 5-27 or Engine Coolant (3.9L Engine) on page 5-31
for more information.
If no coolant is visible in the surge tank, add coolant as
follows:
How to Add Coolant to the Surge Tank
{ 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.
Notice: This vehicle has a specific coolant fill
procedure. Failure to follow this procedure could
cause the engine to overheat and be severely
damaged.
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