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Sounds to me like the IAC valve (Idle Air Control Valve) needs to be replaced. It's not a hard thing to replace. The IAC opens and closes to allow air into the throttle body when the throttle blade(s) are closed (which is at idle). It might be dirty or have debris lodged in it which is causing it to act up. I've been able to replace them on older 2005 ...


Stopped by a mechanic on my way home from work. The popping sound is the compressor clutch. The reason it's making noise is that the friction material is getting worn down, so you're hearing metal on metal when it's slapping together. It sounds little bit like air escaping (the PFFFT sound described earlier) because it's slipping a bit without the friction ...


In addition to the suggested insufficient refrigerant or debris, it could also be a pressure safety sensor going bad. That can cause the compressor to cycle on and off even if you have a full charge. Keep that in the back of your mind if it's not the other things.


The source of the pffft sound is the AC system's expansion valve. It is normal to hear it when the AC engages/disengages; it doesn't indicate that the expansion valve has an issue per se. However, what is not normal is that the AC is cycling on and off so frequently. 6-7 seconds tells me that something is disengaging the compressor clutch. This could be ...

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