This past week its been near 10 below and -25 windchill. ive been plugging in my truck everynight and during the day at school. i realized this morning that my heater burned out because when i went to start it cranked really slow like it does when i forget to plug it in. I tried plugging it in at school too but had the same results. I was wondering how to replace the heater myself or if i should take it and have a shop do it. I dont really have the money required to have someone else do it though. I already have a working heater from my old block. can i reuse this heater or do i have to get a new one?