2004 Oldsmobile Silhouette Owner's Manual - Page 326

Checking Coolant The coolant recovery tank is located on the driver's side of the vehicle, above the engine air cleaner/filter. See Engine Compartment Overview on page 5-12 for more information on location. Adding Coolant If you need more coolant, add the proper DEX-COOL® coolant mixture at the coolant recovery tank. {CAUTION: Turning the radiator pressure cap when the engine and radiator are hot can allow steam and scalding liquids to blow out and burn you badly. With the coolant recovery tank, you will almost never have to add coolant at the radiator. Never turn the radiator pressure cap - even a little - when the engine and radiator are hot. Add 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 above the FULL COLD mark or a little higher. 5-24