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KitchenAid KSSS42QJT00 - Weird Low-Side Service Port

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... unless it was a line rupture, and the oil "sprayed" out.

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The return line attaches to  the compressor housing, (  the round metal ball)...........The refrigerant enters the inside of the compressor housing  ...........The inside of the compressor is the low side..............The pump pulls the refrigerant from the low side /in side the housing and pumps it out the high side ............The oil is in the lower part of the  same low side / housing.................... oil is basically sloshing around inside lubricating the pumps moving parts.......Some oil  is sucked into the pumps intake and is pumped thru the system with the refrigerant, another reason to not mix refrigerants is  because the oils are different ( R-12 vs. R134A ) .........On a  system with a high side leak , you start to look for a spot of oil on the tubing or the condenser , as oil is being pumped out with the refrigerant..........................................

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