2003 Pontiac Bonneville Owner's Manual - Page 287

Checking Coolant The engine coolant recovery tank is located in the engine compartment on the passenger's side of the vehicle, near the windshield. See Engine Compartment Overview on page 5-74for more information on location. Adding Coolant If you need more coolant, add the proper DEX-COOL@ coolant mixture at the coolant recovery tank,but be careful not to spill it. The vehicle must be on a level surface. When your engine is cold, the coolant level should be at the FULL COLD mark or a little higher. When your engine is warm, the level should be up to the FULL HOT mark or a little higher. Turnin- :he rai tor pressure ~ - w..,n the 2 engine and radiator are hot can allow steam and scalding liquids to blow out and burn you badly. With the coolant recoverytank, you will almost never have to add coolant the at radiator. Never turn the radiator pressure cap -- even a little when the engine and radiator are hot. -- 5-28