Buick 2001 LeSabre Owner's Manual page 257

3. Fill the radiator with the proper DEX
coolant mixture, up to the base of the filler neck. See
"Engine Coolant" in the Index for more information
about the proper coolant mixture.
5-16
5. Put the cap back on the coolant recovery tank, but
leave the radiator pressure cap off.
R
-
COOL
4. Then fill the coolant
recovery tank to the
FULL COLD mark.