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NO! Do not run the compressor while evacuating the system!
The Freon is also the carrying medium for the compressor lubricant, if the compressor runs with low Freon, it has a _very_ good chance of seizing. This is why the cars have a low-pressure cut-out sensor that shuts down the compressor if the pressure of Freon drops below a certain point.
The only way to get the R-12 out is to pull a vacuum on the system for a few hours. Furthermore, you _cannot_ just put R-134a in after evacuating the R-12. You need to replace the condensor (if you want adequate cooling, R-134a will use a larger condensor if available) and will definitely need to replace the receiver/drier as well as changing the compressor oil. THe oil that is used with Freon does not dissolve into R-134a and so is not carried through the system with R-134a. This means that just dumping 134a into an evacuated R-12 system will eventually result in compressor problems.
Take the car to a qualified shop unless you're just dumping R-12 into it.
Aaron
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Silver 1998 Volvo S70 T5 <- Daily (Anja)
Guards Red 1986 951 <- Seattle car (Gretchen)
White 1976 914 2.0 F.I. <- Prodigal car, traded away then brought back again (Lorelei)
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