I'm brand new to the list, and my first request for help concerns = my "Rear Heat Exchanger". I had replaced 2 years ago with a new one = after the old one was leaking. This past fall though the new one began = to squeak at times when the blower was turned on. After a couple of = weeks of this, one evening I noticed smoke coming up from the back of my 84 Westy. I parked and checked it out and found the = plastic near the electrical connectors leading to the blower had melted. (source = of the smoke). I disconnected the connectors, wrapped them with = electrical tape and am planning to replace something. Although I'm not exactly = sure what. I'm guessing the fan wouldn't turn due to something so far = unknown and that heated up the electrical system, melting the plastic. = Do you think I can just replace the fan portion or do I need to replace the = whole unit again???