2010 Fusion SEL engine shut off when AC was turned on
A few days ago when I turned on AC (first time of this year) while waiting for traffic light, the battery light was on and engine shut off. It drives normal when I turned off AC and restart the car. This problems continued for a few days. Battery is normal. However today I tested again, and everything back to normal, i.e. engine works normal while AC on. I wonder what the problem could be. It was scary. Imagine if I turn on AC while I am driving on highway
Battery light coming on was probably because the engine was off, and probably not a cause for the stall. I also do not think you'd have to worry about the engine stalling while you're driving along, as the engine speed is high enough as to not be stopped by the extra load of the AC compressor. That being said, if your AC had not been used in months(but it does come on when you use defrost), it's possible that the oil in the system had collected in the compressor or elsewhere, in such a way that the compressor is very bogged down temporarily, and the extra load from that might be enough to stop the engine at idle while in gear.
Thank you, Rod. Your answer made me feel better. Do I still need to go to the dealer to get if checked?
Very good Rod, you were right on, all the way up to the point of the idle, today's vehicles have computer controlled idles, so when the A/C was turned on it should have compensated for the increased load and prevented it for bogging down and quitting, as it seems to have straightened out, at this point I would recommend that next time your by a parts store that can test for codes have it checked for any, it may have just stored them in memory, but are not critical enough to light the check engine light. HTH
Thanks a lot, Tennisshoes. I will go to parts shop again and get it checked.
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