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Discussion Starter #1
hi guys,
what do they mean when they say flush the AC system. ?
what do they flush it with, a solvent of some sort ?
do they remove all hoses where they connect to devices ?
how is it done ?

thanks,
kevin
 

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It turns out that you can get all sorts of nasty stuff in the AC lines, especially when a compressor fails. The only thing that's supposed to be in those lines is the refrigerant and a special AC oil that lubricates the compressor (the only moving part). But other stuff like metal filings from a worn compressor, water and rust if the line-seals failed, the AC-oil can sludge-up when it mixes with the contaminants... all that stuff can get in there too as the system ages.

Anything in the lines that isn't supposed to be there is bad, bad, bad for compressors. For all the same reasons (crud in the lines), they generally also replace the orifice and the dryer unit because you don't, or can't generally clean those items. They are wear-and-tear items and relatively inexpensive anyways. Removing those items is easy to do and it pretty much separates the rest of the AC system into individually accessible, and flushable sections.

So the "good" AC shops, whenever they have to do major work, involving AC parts replacement, especially a new compressor, will flush the lines, the coil (the part inside the car), and the condensor (the part out by the radiator) with a special solvent designed for AC line-flushing before they put it all back together. They pressure-squirt the stuff in one end, and it comes shooting out the other.
 
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