Had a Ford tech tell me that in Ford orifice tube systems most of the oil will settle in the compressor and accumulator.
So when he changes both at same time he puts in the full amount of oil charge.
Anyone heard this? Or does it sound like recipe for over oiling?
Factory technicians can become singularly focused on a prescribed factory fix, and thus apply this fix with a broad brush.
Say we have a fully charged and perfectly functioning system that needs the compressor replaced under warranty for a known defect; this may be Ford's prescribed fix, as it is quick (got to keep that warranty labor cost down) and the over oiling issue could be minimal and acceptable for the remainder of the warranty period.
But as soon as a system becomes low on charge, more oil is accumulating in the evap and not the accumulator. Now if we apply that procedure, we have a high probability for over oiling. Older systems and compressor failures produce old, burnt, and overworked oils we do not want to leave in there; as well as additives, metal shards and particulate contaminations that must be removed.
The only way to know how much oil is really there is to flush it all out and replace with new. This is of course time-consuming-- as HECAT noted, a manufacturer only cares that the system outlast the warranty.
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