[jcus]

Jim, @"jcus"

I see in another post where you did indeed rebuild the original compressor. Did you find any smoking guns or clues to the problem? Do you think you got a poor reman unit, or did you find another root cause?

Richard,
Original and replacement compressors both blew out head gaskets. In doing so, allowed water side to
enter air side when compressor was unloaded. Head gaskets look like some thin type of aluminum foil
on both of them. Rebuilt with kit that had a real fiber type gasket, also bought 250 psi relief valve that
screws in top of head. [Neither one of the compressors had one.] Valves were good, so only changed 
unloaders. Also changed d2 and air dryer. Capped off comp suction line on intake manifold and put a air cleaner
on the compressor intake. [water in the engine intake manifold gave me a scare]
As any good engineer will ask you when something breaks is " what is the last thing you did to it?"
Because I threw away the turbo blanket, intake manifold air was running 150+ for a while.... 
cannot see why this would cause problem, but have now reinsulated exhaust. No long trips yet, so time will tell.
This was the only real change from before problems to after problems.