as of right now i dont know if my temp needle problem has to do with the alternator or the engine itself. after i warm it up and drive for awhile or drive pretty hard, the temp needle goes up, which makes me think that something is wrong with my engine like a bad head gasket. but when i turn on my headlights or heater, the needle also goes up? so what do you guys think it is? electrical or not? car runs fine as far as i know. no coolant lost and no oil lost i think.