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Q: Miscellaneous on 2004 Buick Rainier

While driving with the air conditioner on, the vehicle feels like it wants to turn off & when I stop at the light it does. It runs fine without the air conditioner on. What is causing this? It just started happening.
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Sounds like your A/C system is putting too much load on your engine or that your engine is not compensating the idle speed for the extra load the A/C Compressor is putting on the engine. I would start with the Engine Performance Diagnostics. best way is to check the codes in the computer to see if you have a sensor/system that is going out, like the Idle Control Motor or Electronic Throttle Body System.
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