Hello friends

have another question for you all. wifes 99 expediton 5.4 dual air a/c 90000 miles. Started acting up by not cooling like it use too so i put my guage on it and got 60 low psi and 275 high psi at 104 temp outside just curious of what could be wrong before i have to take it to the stealership.
thank you all for your help.

 

rub, I have a question for you... where is the low-pressure port? I cant locate it.. I went to try and charge the system but all I found was the high-pressure port near the radiator. :\

 

It is on the accumulator located on the firewall under the power center, on the right side. PIA to get to.