GM Service Manual Online
For 1990-2009 cars only

Notice: The radiator cap on your vehicle is a pressure-type cap and must be tightly installed to prevent coolant loss and possible engine damage from overheating. Be sure the arrows on the cap line up with the overflow tube on the radiator filler neck.

The radiator pressure cap is located in the front of the engine compartment on the passenger's side, near the diagonal cross brace. See Engine Compartment Overview for more information on location.