Chevrolet 2001 Impala Owner's Manual page 273

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.
5. Fill the radiator with the proper DEX
coolant mixture, up to the base of the filler neck.
See "Engine Coolant" in the Index for more
information about the proper coolant mixture.
If you see a stream of coolant coming from an air
bleed valve, close the valve. Otherwise, close the
valves after the radiator is filled.
6. Rinse or wipe any spilled coolant from the engine
and the compartment.
7. If you have the 3800 V6 engine, replace the
3800 Series II V6 engine cover shield.
A. Remove the oil fill tube, with cap attached,
from the valve cover.
B. Insert the catch tab on the cover shield under
the bracket on the engine.
C. Place the hole in the cover shield over the hole
in the valve cover. Install oil fill tube and cap by
twisting clockwise.
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