Ok, i had a post yesterday bout not having heat in my car, i changed my thermostat and now i had heat in burst but still got cold, so then i thought maybe there was a clog somewhere and went to get it flushed out at my uncles shop, he blew out the heater and now ::drum roll:: its leaking! im getting some coolant inside and that nice greenish fog right above my dash ( i wasnt getting this before i went to the shop), so now i need a new heater core, i searched but where can i find a step by step guide on how to change my heater core?