assuming that your throttle is set correctly, I am going to blindly assume that perhaps your eletric Fan is not working correctly. Make sure that it is...I had this same thing happen to me and I was pleasantly surprised at what a quick fix it is! Turn your Air Conditioning on HIGH for a minute with the hood open and check to make sure that your eletric fan is running. Have you checked the hoses to make sure there are no leaks...? I wish you the best of luck!