Quote:
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Originally Posted by leathermang
" I don't think that changing the oil is an absolute necessity"
One item which changing the oil does is make sure the correct amount is in the system... draining and flushing the old out....and measuring what you install is the only way to know for sure...
NO book I have ever seen says it is ok to not replace the Reciever/Dryer once a system is opened up... or a refrigerant is changed... the dessicant sack is under oil... and neither the oil in a tube ... or the moisture captured by the dessicant can be removed by evacuation...
When the books even suggest putting fresh oil into the evacuation equipment they must think that having fresh dry oil in the actual AC system is relatively important...
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I don't know rockin's financial situation, but on an old R12 based system, unless contaminated by water or something else, mineral oil is not usually very suspect to easy contamination by water(unless the system has been left open to air at all). I agree that replacing the dryer is always the best course of action(along with the oil and expansion valve), but no harm would come of trying a recovery/deep vacuum/recharge to see if the "non-approved" refrigerant is actually the cause of his problems.
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1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle
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2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K