1998 Buick Park Avenue Owner's Manual - Page 260

T%%%Y...,I w... 3. 4. 5. 6 . Start the engine and let it mn until you can feel the upper radiatorhose getting h ~ tWatch Q U fop the . ~ engine cooling fans. 7. By this time, the coolant level inside radiator the filler neck may lower. If the level is lower, add be more of h e proper DEX-COOP coolant mixture ahrough the filler neck until the level reaches the base of the filler neck.