Cadillac 1993 Fleetwood Owners Literature page 248

How to Add Coolant to the Radiator
You can remove the radiator pressure cap when the cooling system,
includinp the radiator pressure cap and upper radiator hose, is no longer
hot.
-
1. Turn the pressure
cap slowly to the
left until it first
stops. (Don't
press down while
turning the
pressure cap.)
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u
7
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r
U
-
If you hear a hiss, wait for that to stop. A hiss means there is still some
.
pressure left.
2. Then keep turning
the pressure cap,
but now push
down as you turn
it. Remove the
pressure cap.
L