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Old 06-05-2010, 10:39 PM
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Join Date: Jan 2003
Posts: 259
Flushing Air conditioning - 560SEL

Is it possible to flush the low side with the expansion valve connected?

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Old 06-06-2010, 01:21 AM
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Join Date: Jan 2003
Posts: 259
I removed the ac compressor and dryer today and flushed the high side with very little residue to speak of. the flush fluid was clear that I can see. I poured it through the hose (top side) and pushed it through using air compressor.

The AC compressor is totally empty, and the o-rings (6 black in color) appears to be in good shape.

I removed the panel below the steering wheel and visually, I found the exp valve to be dry and clean without any traces of any leak, so I thought I would leave it alone. I was planning on flushing the low side and just push it with air, perhaps mid psi ( not too high).
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Old 06-06-2010, 11:43 PM
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Join Date: Sep 2004
Posts: 9,087
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Just flush it all, it is a waste of time not to since the system is open. It would be like taking a shower and only washing yourself from the waist down.

Best way to flush evap core is to remove the exp valve, drill a small hole in the liquid line, reinstall, then flush from under the hood.

I'm not a doctor, but I'll have a look.

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