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Charlie=> please outline the basics of the Type 3 heating system The basics: Air enters the car through louvers in the rear, drawn in by the engine fan. Most of it goes to cool the engine, but two diversions from the (aluminum) fan shroud carry air down through two tin elbows into the rear heat exchangers, where it is warmed by waste heat from the exhaust manifolds of the rear cylinders. It moves from there into the larger pair of heat exchangers for the front cylinders. One of your heat levers controls the flaps in the front of these exchangers. The right exchanger has a hose going to the engine air intake for carb heat. Flaps open, hot air moves through the large flex hoses to the body. Just before it enters the body, it passes through a large valve on each side with a built-in thermostat. This meters in cool air from a smaller hose, coming off the fan elbow, to help prevent tennie-burn. Inside the body, the warm air passes through a pair of mufflers under the rear seat, and divides into rear and front heat. If you have a Ghia (T34), the left side will also divide to an outlet under the rear window (Fastbacks too?). The other heat lever controls flaps in the rear underseat outlets for front-to-rear mix. Front heat moves through the heater channels behind your rocker panels, famed for intense rust repair, and divides again into footwell and dash heat. The little grilles by your feet should have sliding doors on them, under the carpet. Under the dash, paper hoses carry hot air to the windshield. In the early models, heat and defrost are the same thing. I imagine things get a little more complex in later models, but you wanted the basics. Hope this helps! Steven Ayres, Prescott AZ '66 343 ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe