don@nebr - 12/9/2018 22:20 What year and model merc is that, I forgot? If your going to pull the radiater to fix it, might as well take out the heater core also. Can always fix the paper duct with some cereal boxes inside out, paint outside black and make what works and then cover all inside and out with fiberglass kit, cloth and resin. It will be better than it ever was and not real hard to do. Thanks for telling me about old Ford site. That looks good to me. I didnt want to buy a used one cause get right back to where I am today. I already learned leaving the switch on for even 10-20 minutes can fry the coil. Didnt know that yesterday. Probably what happened to it 30 years ago or so.