I have a 93 cobra with a S trim blower and a snow performance boost cooler. The radiator is by Fluidyne. I would like some advice as to why at times under normal driving conditions I see my radiatior begin to climb high on the gauge all of the sudden. I then go to turn on the heater full blast to assist with the problem at which time cold air is blowing through the vents. Approx 10-15 seconds later the heat suddenly kicks through and the gauge drops down to normal and all is well... however I later check under the hood and see that some coolant has been spewed out onto the battery from the over flow bottle. Is this a thermostat problem? any suggestions-help would be appreciated. 50John