Pontiac 2004 Grand Prix - Manual (Page 319)

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.
4. After the engine cools,
open the coolant air
bleed valve located on
the thermostat housing
near the heater hose.
3800 Supercharged Engine
Thermostat Housing
5-39