Installing a new ac compressor on a gm 2.4, do I have to put oil in the compressor before installing, and will it work without oil?

Most new compressors that I know of has oil in them already check with where you purchased the compressor and ask or the instructions should tell you if it has oil in it already.

On a new compressor installation it is always recommended by the manufacturer to install oil into the back of the compressor on the suction side. Then place the compressor on a level work bench and turn the pulley to distribute this oil. Since this is a new replacement the a/c companies recommend that you also replace the accumulator and the orifice tube on your GM car and have the system flushed to remove any system contamination.

How many hours does it take to change an AC unit on a Pontiac Sunfire

That is a 2000 Pontiac Sunfire compressor how long does it take to change it