Re: How to flush out old A/C oil? - Saab 900 Bulletin Board - Saabnet.com
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Re: How to flush out old A/C oil?
Posted by MS (more from MS) on Thu, 29 Jun 2006 10:50:08
In Reply to: How to flush out old A/C oil?, kyle morley, Thu, 29 Jun 2006 06:58:13
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I honestly don't know how possible it is to effectively flush with the system in place. I'd at least disconnect the receiver drier unit and flush on either side. Also, the expansion valve is considerably restricted in terms of air flow, so that should be bypassed as well. I'm guessing one way to do it would be to pour in a considerable amount of a solvent such as paint thinner, then blow it out forcefully with compressed air. Do that a few times for each main component such as the compressor, evaporator and condensor, then use a vacuum (a shop vac is what I used on the seperated components) hose to draw the remaining solvent fumes and moisture out of the system, usually by leaving the attachment in place and allow it to draw air for at least 15 minutes. Because the compressor has an access plug on it's side, that's one way to fill and drain it of solvent. I'd be especially mindful of making sure any and all solvent was drained from the compressor. One way to flush the compressor without solvent is to fill it with the appropriate R134a oil, agitate by turning the outer pulley disc, then drain it. And that's all you really need to do because having some surface oil inside the compressor is required. You don't really want it bone dry after a solvent cleaning.
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