It depends on which vents you speak of: the two vents that are parallel to the facia and have open/close switches are fresh air only. The consensus is that is that the two dash vents at the front are a mixture of fresh and hot air. Hot air can be increased to these two by as you described, shutting off the fresh air flow (2nd from bottom); the two smaller vents that feed the side windows are hot air only but the flow is fairly weak unless you are moving or revving. As for increasing heat flow I have placed in the line of the hot air flow (pipe is accessible at the front by removing front grille) a 12 volt marine fan which provides enough hot air through all four windshield defrosters for decent warming. This works even at temps at or below 0 C. Earlier vanagons had no fresh air blower ; so yours may be a transition model.....There was big discussion on this about 2 months ago; check the gopher and search using the terms heat, vent etc.....Good luck - DC PS blocking off the fresh air intake is also recommended....DC ---------------------------------------------------------------------- David Carment School of International Affairs Carleton University Ottawa, Ontario K1S 5B6 voice - (613) 788-2600-6662 fax - (613) 788-2889 Email address: dcarment@ccs.carleton.ca ----------------------------------------------------------------------
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