Never! If it's low on refrigerant it has leaked.
If the system was drained, or leaked out, yes it needs evacuated.If the system was drained, or leaked out, yes it needs evacuated.
.You can remove the air conditioner compressor, from your Oldsmobile automobile, by removing the compressor belt. Remove the air conditioning Freon. Remove the Freon lines. Remove the retaining bolts
Yes! Freon leaks out during the winter months!
The Freon probably needs to be recharged. Any repair shop should be able to do this. They should also test the system for leaks to see why the Freon leaked out to begin with.
A machine that reclaims Freon is needed to remove the old Freon. The system will then need to have a vacuum pulled, and then the new Freon can be added.
Lime
Not without some specialized equipment. Any good A/C repair shop can remove the Freon, replace the switch, and install the same Freon again, thus loosing none.
Remove the freon from the system. Disconnect the compressor belt, then remove the lines. Unbolt the compressor and remove it. Install the new compressor, connect the lines and belt. Pull a system vacuum, then fill with new freon.
remove freon,pressure up system with dry nitrogen to 250psi & go over it all with soap & water .
u dont
Drain the freon from the Montana into a reclaiming machine. Remove the compressors drive belt. Disconnect the freon lines from the compressor. Unbolt the compressor and remove it. Bolt the new compressor into place, then connect the lines using new gaskets. Hook the belt back up. Pull a vacuum on the system, then fill with freon.