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On 4 Jan 2001, at 15:56, Steve Bradley wrote: > Just curious, why did VW design the heater this way? What difference > does it make whether the air-mixer box pulls fresh air from the fan > housing or directly from the outside? Because it is not pulled, it is pushed. A fan of some kind is required to force the air forward and overcome the pressure of the heated air which has also been pushed forward. If you take these hoses off, hot air will be forced out of the top of the mixer boxes. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- Pitch in! Send your pledge of support! mailto:support@vwtype3.org