Chevrolet Monte 2003 Owner's Manual page 287

3400 V6 Bleed Valve #1 3400 V6 Bleed Valve #2
3800 V6 Bleed Valve
4. After the engine cools, open the coolant air bleed
valve or valves.
3400 V6 engine: There are two bleed valves. One is
located on the thermostat housing. The other is
located on the thermostat bypass tube.
3800 V6 engine: There is one bleed valve. It is
located on the thermostat housing.
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