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When you flush the system , you will get most of the old oil and r12 residue out. any r12 mineral oil left in any low spots( which youshouldn't have any if you take everything apart ) will just sit there. R134 will not absorb the r12 mineral oil and circulate it, the stuff will just sit in a low spot. make sure to drain the compressor ( there should be a plug on the bottom, but if not, you'l need to pul it and drain it out the ports)
The screens or filters can be purchased from a number of online AC parts sources.
Well. on checking, the inlet screens have fallen completely out of favour and nobody is carrying them anymore. There are some filters that will fit in the high pressure line between the condensor and the expansion valve . http://shopping.keepitkool.net/index.php?act=viewCat&catId=7
You would need to remove the high pressure hose between the drier and the expansion valve and take it to a hose shop and have them replace the hose with barier hose and either make the metal end near the drier longer to insert a filter there ( probably the cheapest option ) or insert a metal tube section in the middle somewhere and leave it cut in the middle to install the filter. They go on with a compression type fitting.
Or save the filter and just make darn sure that you get everything flushed out, but it can be a gamble.
Whichever way you go, make sure to flush it good before doing anything ( you don't need to buy the high dollar flush gun, the $3 harbour freight siphon gun that attaches to an air line works nicely with the bulk liquid flush, or you can get the aerosol flush, which costs more, but may be easier)
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-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '92 Ford F350 diesel dually
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