1995 Cadillac Eldorado Owner's Manual - Page 246

1. You can remove the coolant surge tank pressure cap when the cooling system, including the coolant surge tank 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.) If you hear a hiss, wait for that to stop. A hiss means thereis stillsome pressure left. 2. Then keep turning the cap, butnow push down as you turn it. Remove the pressure cap. 5-19