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What type of coolant do I put in a 2001 Chevy Impala ac unit?

Your 2001 Chevy Impala does not have refrigerant in its air conditioning unit, it uses either R-12 or R-134a. You should check the AC lines under your hood to see what type of refrigerant you need to add. R-12 is usually identified with a green cap and R-134a is usually identified with a blue cap.