Buick PARKAVENUE 1994 Manual page 250

Adding Coolant
The coolant recovery tank is located at the left of the
engine compartment.
To Check Coolant
When your engine is cold, the coolant level should be at
"FULL COLD' or a little higher. When your engine is
warm, the level should be up to "FULL HOT" or a little
higher.
COOLANT
LOW
If this light comes on, it means you're low on engine
coolant.
To Add Coolant
If you need more coolant, add the proper mix at the
coolant recovery tank.
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