"copeland compressor stopped working on freezer, blower works model KAJB-007E-IAA-800, there's one shrader valve with 175 psi I believe this is the high side if so can't locate low side shrader valve there are two other screw off caps with no valve stems. have been manually cycling defrost timer. i measured comp winding and had 2.2 ohm between r-s, 1.6 ohm between s-c and .6 between c-r no ohm reading from gr - comp case any suggestions?" I bought some 404a refrigerant I thought it may be low on refrigerant.