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Old 08-28-2013, 09:15 PM   #6
77newell
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Join Date: May 2008
Location: Just North of Detroit, a surprizingly great city
Posts: 380
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There is one anomaly with this system that I have previously experienced. When I turn the heater or defroster fans on without the AUX VENTS fan on I notice some air being sucked back down those side vents. This happens because all those fans are drawing from the same space above the heating and cooling coils. Those coils somewhat restrict airflow so it is easier for the main fans to draw air backwards through the side vents and fan if that fan is off. There does not appear to be anything to prevent this backward flow except turning the AUX VENT fan on.
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Jon and Alie Kabbe
Started with 77 Coach
Now have 39' 93 coach
2007 civic toad
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