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What kind of ac coolant is needed for the 1997 Monte Carlo 31 liter engine?

The 1997 Chevrolet Monte Carlo, regardless of engine size (there wasn't a 31-liter engine offered), uses R-134a refrigerant for its air conditioning system. There were several engine options available for the 1997 Monte Carlo, but none were even close to 31 liters. A 31-liter engine is enormous, much larger than anything ever used in a production car. You likely have a typo in the engine size.