I have a 2006 VW Jetta TDI that has an underperforming R-134a Sanden AC unit. When at 2000 rpm, my system pressures are 25-27 psi low, 240-250 high but with a cold air temperature of about 57F with the fan on high, recirc on and windows down and outside temperature at 85F. All measurements in my garage out of the direct sunlight. I just recently discovered one of my radiator cooling fans (small one) was not working and have replaced it. Both are working now. I have checked the evaporator temperature probe and it seems to be in working order (1090 ohms at room temp and shows a decrease in resistance with increasing temperature).
Any suggestions would be most appreciated and, of course, if I've left off some critical information, let me know and I will set about to get it for you.
Thanks in advance.