Hi, I wonder if somebody out there may be to help me with a heating problem. A while back we had some really cold weather and although I had anti freeze in the car whilst driving to work the red temp light came on, stopped the car and steam was pouring out of bonnet. I guess the anti freeze level may not have been as I thought but the result was the header/expansion tank blew a hole in it. I replaced the tank but since then my internal car heater/blower only blows cold most of the time, I put in a used matrix and a new thermostat but the only time it gets warm is at high revs, before this it was hot regardless of the engine revs. I have a Seicento Sporting, I have also tried releasing the cap to ensure no air lock and the water in the tank does get warm. Any help would be greatly appreciated. Thanks