the other day i was driving home from a car show and my temp gauge shot up to the red bit so i pulled over and the expansion tank was over flowing and steam was coming out. i let it cool down and checked the rad it was empty i got it towed home and checked the thermostat and it was stuck open so ive replaced that filled the rad up correctly again and it drove fine for about 50 miles then the same happened again, the heating has never worked since i bought this well a little bit of heat comes out when im on the motorway but thats about it. could this be to do with the overheating or what else could it be?