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???