Chevrolet 1999 Monte Carlo Owner's Manual page 201

3. If you have the 3800 V6 engine, remove the
3800 Series II V6 engine cover shield to access
the bleed valve.
A. Clean the area around the engine oil fill tube and cap
before removing. Twist the oil fill tube, with cap
attached, counterclockwise and remove it.
B. Lift the engine cover shield at the front, slide the
catch tab out of the engine bracket and remove the
cover shield.
C. Put the oil fill tube, with cap attached, in the valve
cover oil fill hole until you're ready to replace the
cover shield.
3100 V6 engine: 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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