Idle air valve 95 jetta problem

Ok, so here's the problem; My IAV doesn't compensate for load when I turn on
the A/C. It just goes from 840rpm down to 640 and stays there. Same thing
with the A/T. Put it in drive and it drops to 640 and stays there. I cleaned
the valve, also quick checked it by pulling off the coolant temp sensor
harness and the engine indeed surged and returned to normal. I'm trying to
determine where the communication breakdown is, but I thought I'd ask the
general question to see if anyone had any experience with this exact
problem. Thanks

Tim