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Correct. Fresh air is pulled in via the fan and pushed into the heat exchanger. The nice (and smart!) thing with the 914 exchanger (I'm not familiar w/the Bus) is that the air ran down the exhaust pipe, came to the end at the butt of the car, turned around 180-degrees and traveled back towards the cabin on the OTHER side of the exhaust. Instead of flowing just once over the exchanger like ours it traveled the length of the exhaust pipe twice, so the air got REAL warm! I know and I loved it! Heater over-kill...this is what our cars need!! Toby "previous 914 owner -- gawd I miss that little girl!" Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed '95 VW Jetta III GL 2.0L, P-Chipped, Jamex sport suspension Portland, Oregon, http://www.icbm.org/ >-----Original Message----- >The type 4s, same engine, did the same thing, only they did it first. >The 914s may have done this also. ;-) ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/