The freon goes thru the compressor in a gas state. The compressor can not compress the liquid. Therefore the liquid going thru the compressor would be like puting a liquid in the cylinder of the engine. It does not compress and something will have to give. In this case it will be a piston or connecting rod. About the same thing with your compressor.
So the freon is connected to the suction side of the compressor. It only sucks gas. It can suck or be force fed liquid but you don't want to do that.
The training manuals will talk about warming the freon container. Don't over heat the container, it can explode. 110-120 water is fine.
With the larger freon tanks (20#), you can buy an electric blanket to warm the tank.
1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car