1994 Buick Park Avenue Owner's Manual - Page 213
1994 Buick Park Avenue Manual
Page 213 highlights
When the coolant in the coolant recovery tank is at or above the "FULL COLD" mark, start your vehicle. If the overheat warning continues, there's one more thing you can try. You can add the proper coolant mix directly to the radiator but be sure the cooling system is cool before you do it.
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