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The 2007 Chevrolet Impala offers four different engines based on the model you choose. There are two 3.5L V6 engines, one of which is FlexFuel compatible and the other is not. Both of these engines require 10.1 quarts of coolant. The larger 3.9L V6 engine also needs 10.1 quarts of coolant, while the largest 5.3L V8 engine requires an initial fill of 13.3 quarts. Despite the variety of coolants available, the Impala is not too specific about the type you use. Many drivers prefer using Dex-Cool, while some find that Prestone 50/50 is the most effective. It is crucial to avoid mixing different coolants as it can lead to chemical reactions forming a thick, viscous substance. If you are unsure about the coolant in your Impala, it is recommended to drain and refill with your preferred option.
That's a different story when it's filled up, and how many did you withdraw? Those are never identical either.
In 2007, the Chevy Impala has a coolant capacity of 5 quarts.