Pontiac 2006 Montana SV6 Owner's Manual page 337

CAUTION:
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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, if your vehicle has the
3.5L V6 engine, open the coolant air bleed valves.
Housing
There are two bleed valves. One is located on the
thermostat housing. The other is located on the
thermostat bypass tube.
Bypass Tube
4. Fill the radiator with the proper DEX-COOL
coolant mixture, up to the base of the filler
neck. See Engine Coolant on page 5-23 for more
information about the proper coolant mixture.
If your vehicle has the 3.5L V6 engine and you see
a stream of coolant coming from an air bleed
valve, close the valve. Otherwise, close the valves
after the radiator is filled.
5. Rinse or wipe any spilled coolant from the engine
and the compartment.
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5-33