[T77911S]

Originally Posted by fastfredracing

Would moisture in an AC system cause the high side pressure to spike super high long before a full charge is in the system? I replaced the condensor, ( massive leak), removed and flushed the fixed orfice pipe, flushed out the lines and evaporator, and vacumed the hell out of this system. But when I am trying to fill it right after I get about half of the reccomended charge in , the high pressure starts to climb to well over 400 lbs. This is at about 80 deg ambient temp, and plenty of air passing over the condensor. The system was left opened for about a week with no plugs to cover the lines/ evap etc... I am assuming I will need to replace the drier , and vacum the piss out of it again.
A clogged orfice tube will cause lower pressures on the high and low side , correct?
I would have replaced it already, but it is part of the liquid line, which is on back order right now.

no, a clog will cause the hi side to go higher (like 400psi) and the low side to go low or even into a vacuum.