Hi

I just bought a FEH 2008 133k nice car but AC not cool when it is 90F outside( i am in Florida ) and it gets cooler with high RPM or/and high speeds.
So I check the Ac pressure:

-getting 55-60psi (yellow)idling at 84F with just cabin AC on and batteries loop off (i think it was off because batteries were fully charged)

- getting 25-35(blue) psi wit just the batteries loop on.

When I rev the car it goes below 25psi and cuts off AC compressor and turns back on when the rev go down (this is with battery loop on, and cabin AC/loop off)

So, I don't now, if my system is properly changing because when the cabin AC is on, I am getting high psi (yellow) and with just the battery loop on, I get acceptable psi (blue)

Is my system overcharged?

There are no specs in the owners manual about AC or AC refrigerant/ ps, where can we get this information?

any suggestions or this is normal...

 

http://acprocold.com/faq/r-134a-system-pressure-chart/

 

Could be that $30 valve in the compressor.