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Q: coolant release valves on 2002 Chevrolet Impala

My previous question remains the same...2002 Chev Impala, 3400 V6 engine...I can not locate the coolant release valves anywhere in the manual. Please help!
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I owned a 2000 Chevy Monte Carlo with the same 3.4L engine. I performed most of the preventive maint. on the car, including coolant replacement (shade tree mechanic). I found two coolant release valves on the top side of the engine (one on the left side, the other on the right. The valves have a small brass screw with a head approx. 1/2" in diameter with a slot on top for a flat head screwdriver. Loosening the valves slightly while the engine is at running temp. should be sufficient for the trapped air to escape (NOTE: removing the screw completely will allow super-hot coolant to spray everywhere, including on you!!!). When you see coolant (no more air bubbles), re-tighten the screw. Be careful not to overtighten, the brass screws are fragile.

Best of luck, be careful, and God Bless.
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