Chevy express van FSM needed!
 

Hey guys, I need some help. I've tried searching google but can't find a PDF version of the FSM for a 2006 Chevy Express 2500 van.

I need to troubleshoot & repair the AC in my dad's truck but can't find exactly what's causing the AC to start/stop rapidly. Pressures are ok, but something is cutting the voltage to the compressor clutch.

And to make it worse, my sales guy at the dealership doesn't have access to the service manuals :(

Any help would be great! Thanks.