I'm heading off to work to work on my car. I have to back flush it and try to unclogg my heater core, does anyone have any ideas on how to do this? Is there a chemical or anything that would help? I'm also going to change my T-stat cause i think that might be stuck, i think closed, cause I ain't got no heat and my car was over heating, the mustang. I am going to work on it in about 2 hours so any help would be great, thank you all.