Member-me. I don't have the car anymore, but it's not that hard if you have the new heater core for the dimensions to cut the hole. Make a pattern with the new core, and then add a quarter inch all around for the cut. You'll need to weld a lip around the piece you cut out, and put some weather stripping on it when you screw it back on. That pretty much sums up the howto. Tools required dremel/rotozip or equivalant and the means to weld the lip to the pice you cut out.shadow99 said:There are memebers here who have cut a hole in the firewall behind the core and removed it that way. I was asking but never got a detailed how-to on that one. But if mine goes, I'm cuttin a hole!