Buick 1999 LeSabre Owner's Manual page 219

First Edition for Buick LeSabre Owner's Manual – 1999
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2. Then keep turning the pressure cap, but now push 3. Fill the radiator with the proper DEX COOL
down as you turn it. Remove the pressure cap. 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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