Something else could be wrong...should be enough pressue in can to turn on....best to have someone check to see if there is any pressue in the system. Too often I see systems getting overcharged not having full understanding how a/c system works.
I took your advice and took the Van to a service center. They evacuated the system and put a suction to it for almost an hour. Vacuum held just fine. They filled the unit back up and the compressor still would not start. I paid them for their time and 134a and did some further trouble shooting. Checked fuse, okay. Checked relay, okay. Checked power to compressor, before connector and after connector and there is power. Before I evac the system again and change our the compressor again, (it's only 3 yrs old), could there be something else I should test?