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Discussion Starter #1 (Edited)
My 2006 Cobalt LS nearly stalls any time I turn on the A/C and am stopped. It'll dip down to right around 500 rpms, idle rough for 1/2 second or so, then idle back up and be fine. But if I rev the engine for any reason and let it come back down, it'll do it all over again. This is especially annoying in stop and go traffic!

NOTES:
1. It never actually stalls and the A/C does blow cold.
2. The battery is new-ish -- but the problem occurred before then too.
3. I replaced the plugs in the last 500 miles -- the problem occurred before and after.
4. Ditto on changing coolant (replaced with the green stuff, not dex-cool) in the last 200 miles.
5. The car never overheats -- nominally 189F, max seems around 225F in stop & go traffic in central TX.

Does this sound like a sensor problem? How can I diagnose what's causing the issue?
 

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I assume you have cleaned throttle body.

ECM is suppose to send a rev-up signal to "TAC"throttle when fans come on. Is the right hand fan coming on when you turn A/C on? If not check fuse. If it does check connections at fan control module.
 

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Does it "almost" stall when you release the gas pedal too, if so, try cleaning the throttle body, this fix costs nothing, well one can of carb cleaner.
 
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