1987 1988 1989 1990 Jeep Comanche L6 4.0L ONLY. 1987 1988 1989 1990 Jeep Cherokee L6 4.0L ONLY. 1987 1988 1989 1990 Jeep Wagoneer L6 4.0L ONLY. The function of the accumulator is to catch and trap liquid refrigerant from the evaporator to protect the compressor.