Okay ill make this quick and simple.

I just got my ac system fixed and i have a new A6 compressor installed, and when i have the AC turned on, the car idles at 500RPM.

How do i get the car to idle higher with the AC on?

(P.S. With the AC off, it idles at 1000RPM, how can make the car idle higher?)

 

You should have a step-up solenoid on the carburetor, that gets activated and pushes on the linkage when the A/C is turned on, which speeds up the idle. You might have: a missing, broken, or unplugged solenoid, a broken wire/bad electrical connection, or the solenoid just isn't being activated by the A/C.