1993 Cadillac Seville Owner's Manual - Page 254

How to Add Coolant tothe Radiator a . , / . ~ ','> _I .I 1. You can remove the radiator pressure cap when the cooling system, including the radiator pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly to the left until it first stops. (Don't press down whileturning the pressure cap.) stop. A hiss means there is stillsome If you hear a hiss, wait for that to pressure left. 2. Then keep turning the pressure cap, but now push down as you turn it. Remove the pressure cap. 240