I dont' have the link handy but on the Montic Carlo site there is a link to a heater core replacement. On that site they show where all the screws that hold the cover on. I used some caulking material from 3M that I got from an autobody parts store. I think it's the same stuff as OEM. It's a black putty like stuff that you make a rope out if and put on the cover. Mine worked out great and looks like it has never been off.