I've read many times how the IAC motor helps keep idle RPMs up when the air conditioning is on... and figured mine was always dead (have cleaned it to no avail) as the A/C always brought RPMs down.

Well, recent tinkered made me aware of the power steering pressure switch, which DOES raise my RPM by about 200 whenever the wheel is turned hard at a stop. So, is the IAC involved in this process? Does this mean mine works? If so, what lets the ECU know that the A/C is on? Is it hard-wired somewhere/somehow? Just wondering if I should be looking for a failed sensor or disconnected wire.

Thanks for any help in understanding how this works.

Bryan
Dallas, TX
Gen I 4-door 3.0 V6