I had this problem, and figured out that the cooling fan wasn't comming on at all. It turned out that the plug had shorted out. I would check to see if the fan is comming on. To check it, put the car in park, and turn on the AC. Now look under the hood. If the fan is off, the fan is either bad, or it isn't getting power. Take a voltage meter and check the plug. If it isn't getting power, check the fuses. Hope this helps.
