a little off topic but...
hello
i am topping off the R134a in my 2010 audi a5

on max ac, with recirculation, 90 degrees F ambient, the center vent cant get down to 39 degrees F. which is great
however, the low side pressure only gets up to 28 psi. the chart indicates that the low side pressure should be 45 psi.

hence: low side pressure too low, but center vent temperature ok

question: does the system still need more R134a?