Pressure Testing: Notes
WARNING: This page is about a different car, the 1988 Pontiac 6000, 1988 Oldsmobile Cutlass Cruiser, 1988 Oldsmobile Cutlass Ciera, 1988 Chevrolet Celebrity, and 1988 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
A cooling system pressure tester is used to test both radiator cap and complete cooling system. Test as follows, following tool manufacturer's instructions.