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Anytime the A/C system is opened for repair on your 1973 El Camino, the accumulator will need to be replaced . These are only used in orifice tube systems and contain a dessicant bag as well. The accumulator provides a similar function as the dryer in the expansion valve system, but is located in the evaporator outlet instead. This positioning allows the accumulator to collect any un-evaporated refrigerant that may still be in the liquid state, hence protecting the compressor from liquid lock damage.
CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov