Did a AC job a Saab 9-5 today. Was low on ref so pulled a vacuum and weighted in the correct charge for it. Still did not work ok. Head was somewhat high at 225 psi for 75 ambient and the suction was way high at 60 psi. Fans working and condenser is clean. It's not over charged so could this be a stuck open expansion valve or something with the variable deplacement compressor thingy?