Buick 2005 Century - Manual (Page 241)

2. Keep turning the pressure cap, but now push down
as you turn it. Remove the pressure cap.
{ 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.
3. After the engine cools, open the coolant air bleed
valves. There are two bleed valves.
One is located on the
thermostat housing.
The other is located on the
thermostat bypass tube.
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