My dad has a KIA Sorento, and has had trouble with the engine smoking. After a couple of weeks he noticed that it only smoked if he had the Air conditioning switched off, and when it was on it stopped smoking. I would have said that if anything it would be the other way around as the air con adds load to the engine. Or is the engine running to rich and the air con uses the excess fuel when swithed on? Look forward to you replies thanx!