Vehicle stalls when A/C is turned on

Hi,

If this only happens when the engine is at idle speed, chances are the issue is related to the idle air control valve (IAC). The IAC is responsible for maintaining the engine's idle speed. When an additional load is placed on the engine, the IAC is signaled to open a bit more allowing the idle speed to increase and compensate for the added load.

The IAC is located on the throttle body. What can happen is this. First, it can fail. Also, there can be an issue with the PCM controlling it. However, most commonly there is a build-up of carbon and dirt causing it to stick.

Take a look through this link. It will better explain what I'm referring to.

https://www.2carpros.com/articles/how-a-idle-air-control-valve-works

I would first try cleaning/servicing it as well as the throttle body. Here are links that explain how it is done:

https://www.2carpros.com/articles/idle-air-control-valve-service

https://www.2carpros.com/articles/throttle-actuator-service

Let me know if this helps. Also, let me know if you scanned the computer for diagnostic trouble codes. If you have and retrieved codes, let me know what they are.

Take care.

Joe