Find the low pressure switch ( can't remember on that model, should be near the accumulator....big thing that looks like an upright can )
FYI, an accumulator is a tank on the low (cold) side. My Camaro has one. The MB systems all have receivers, which is a (somewhat smaller) tank on the high (hot) side. They're very different, but both serve as reservoirs for excess liquid refrigerant. -- Jim
