My friend's S2000 have this A/C issue

A/C is blowing hot air under 2000rpm.
It only starts to blow cold air above 2000rpm.
So no cold A/C at idle makes PITA to drive around in traffic.

The observations
-. A/C compessor is ALWAYS ON
-. A/C gas pressure check out OK


I would appreciate if someone can shine light on this A/C problem.
Thank you!

 

this has been talked about recently. the pulley on the compressor is made to run up to 6-7k rpms so at 1-2k the compressor is "barely" running. if you drive 3-4k rpms it'll be colder and 4-5k colder still. thats what i've observed as well.