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Old 09-17-2008, 05:58 PM   #27
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 41,331
 

2003 L-Series 3.0L Sedan
Default Re: A/C questions upon installation of compressor

Desiccant absorbs water only, no oil. What ever you drain from the drier, use only that amount, no more. The same for the compressor, whatever was drained out, use only the same amount to put back in. Your system is a good example of how oil was distributed throughout the entire system. It would be difficult to prove how oil was distributed unless you're willing to competely flush the entire system and attempt to measure what comes out. The condenser and evaporator coil retains oil as well as the lines and filter/drier. To put in more than whats measured is on the verge of over filling. The only exception to this would be if a catastrophic discharge of refrigerant occurred and a large amount of oil was discharged by evidence in the immediate area. Then you'd have to assume a complete repair with replacement of whatever's necessary and flushing the remaining parts to start over as if a new installation is attempted. A full amount of oil would be distributed for giving the compressor a good chance of immediate lubrication. Unless you have seen evidence of large amounts of oil loss it would be better to follow guidelines. The rules still apply; overfilling of oil leaves less room for refrigerant or you wind up with higher pressures than anticipated because of more oil than necessary that now crowds the closed volume of the system, including the full amount of refrigerant. One or two more ounces oil takes up that much more volume within the system and now filling it with R134a also will cause higher pressures especially the low side as there's less room for expansion to lower temperatures whereas the right amount used will result in the right low pressure readings that translates to correct cooling. Getting creative can cause you some loss of cooling when you're concerned about oil amounts.

The reason for tightening mounting bolts carefully is to avoid stressing the compressor body and inadvertently creating undue load that can translate into a compressor leak.

If you like, go over to http://ackits.com and sign in as a new member and enquire, describing exactly what you're doing. Nothing like advice from the pro's there dealing with a/c issues exclusively. If you're waiting on the drier then you can wait some more before installing the compressor for some better advice on a forum devoted to a/c issues.

Last edited by fdryer; 09-17-2008 at 06:05 PM..

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