Car idles at 750 rpm. When A/C Compressor engages, idle should go up to 1000 rpm but it remains at 750 (engine struggles). What is the fix ?

Car idles at 750 rpm. When A/C Compressor engages, idle should go up to 1000 rpm but it remains at 750 (engine struggles). What is the fix ?

Sorry, my Crystal ball is broke, and I can't find my Ouija board...
Can you tell us what vehicle you have, what year and what engine is in it?

The problem likely resides with the Idle Air Control Valve (IACV). First, check the connector. If it's fine, consider replacing the IACV with a new OEM part. The PCM normally sends a signal to the IACV to increase the idle rpm, when the AC is turned on. Depending on the car, there may be a problem with the operation of the stepper motor inside the IACV. On my Honda, I can clean the IACV; however, on my Ford it's a waste of time and I replaced it with an OEM part. I tried using an aftermarket IACV, but it idled way too high.