I recently had my head gasket replaced by a mechanic. Unfortunately after he finished the work he say's that I need to have the heater coil replaced. I was wondering how come all of a sudden I need a new heater coil when it was working perfectly fine before. I also noticed that once I got my car back it was sputtering and it wasn't getting as much power when accelerating as before. Also is it possible for me to replace the heater coil myself? Any info would be greatly appreciated. Many Thanks to all who reply.