2004 Chevrolet Impala Owner's Manual - Page 300
2004 Chevrolet Impala Manual
Page 300 highlights
3. If you have the 3800 V6 engine, remove the 3800 Series II V6 engine cover shield to access the bleed valve. 4. After the engine cools, open the coolant air bleed valve or valves. 3400 V6 BLEED VALVE #1 3400 V6 BLEED VALVE #2 3.1. 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. 3.2. Lift the engine cover shield at the front, slide the catch tab out of the engine bracket and remove the cover shield. 3.3. Put the oil fill tube, with cap attached, in the valve cover oil fill hole until you're ready to replace the cover shield. 5-38 3400 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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