1994 Pontiac Bonneville Owner's Manual - Page 216

I'o Add C,oolant [f you need more coolant, add the proper mix at the coolant recovery tank. L LOW COOLANT Radiator Pressure Cap If this light comes on, it meansyou're lo\ on coolant. I NOTICE: Add coolant mix at the recovery tank, but be careful not to spill it. Your radiator cap is a 15 psi ( 105 kPa) 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. When you replace your radiator pressure cap, an AC@cap is recommended. 215...