Chevrolet 2001 Impala Owner's Manual page 272

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.
5-18
3400 V6 Bleed Valve #1
3800 Series II V6
Bleed Valve
3400 V6 Bleed Valve #2
4. After the engine cools,
open the coolant air
bleed valve or valves.