normal refrigerant pressure for SV6

[rmilho]

my wife's 2006 SV6 is blowing air that is not as cool as it was yesterday. (enough to tell the difference). However, 55 psi on low pressure refrigerant line. this is high compared to 'normal' vehicles. what is the pressure supposed to be. yes, i did have it on max AC and fans on high (van has rear AC).
please let me know normal PSI. thank you!

 

[melsg5]

30 to 50 low, 150 to 200 high

 

[rmilho]

so...maybe another reason for air to not be so cool?

 

[Zimgxp]

Dirt in the condensor, flush it out with a garden hose.