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Buick 1998 Riviera Owner's Manual page 224

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How to Add Coolant to the Radiator
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
counterclockwise until it
first stops. (Don't press
down while turning the
pressure cap.)
I
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, hut now
push down as you
turn it. Remove the
pressure cap.
3. Fill the radiator with the
proper DEX-COOL@
coolant mixture, up to
the base of the filler
neck. (See "Engine
Coolant" in the Index
for more information
about the proper
coolant mixture.)

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