Anibis"The car runs a bit harder to run the A/C, if the coolant is low this probably put it over the edge and the engine started getting hot. If the coolant gets lower it will overheat without the A/C on. Also the computer will turn off the A/C if the engine starts to get above operating temp, this is why it started blowing warm air.
well, my 03 civic runs harder when A/c is on, it may even shutoff when in motion or while driving. When putting on A/c and at idle, the engine seems to wanna bog down and shutoff, also it makes the car vibrate on and off (this doesn't happen always, but most of the time) and i have to shutoff a/c just to keep car running smoothly without any overload on the engine.
Have changed the A/c Fan so far & nothing else.