'93 ford explorer a/c problems

Changed system over from r-12 to 134a changed drier,replaced all o-rings flushed system and refiled oil to proper levels. Than vacumned system and recharged. Worked for about two weeks started blowing hot air. Was getting 110psi on low side 125psi on high side. Tore back down system found ouy may have accidently left out new orifice tube. reflushed system put in new orifice tube [made sure it was in] went through the procedures of recharging system. Had one can in started to add second can heard a click and the pressure on the low side went back to 110psi and high side 125psi. Have been told might be compressor. Would like to know if anybody agrees with this or could maybe throw so other ideas out there?

 

Compressor should have been changed when the retrofit was done. R134a has alot higher operating pressure then the old R12.

Compressor/Clutch

Receiver/Dryer

Orifice tube

expansion valve and pressure switches

valve stems

ALL need to be replaced for the new 134a.

Who did this retrofit? Only EPA certified mechanics are allowed to vacuum and recharge the refrigerant, legally.