Date:         Mon, 17 Jan 2000 10:08:53 EST
Reply-To:     kenneth d lewis <kdlewis@JUNO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         kenneth d lewis <kdlewis@JUNO.COM>
Subject:      Re: Cold defrost/warm heat 1.9wbx
Comments: To: mcalvin@ICAN.NET

Miguel;
        I made an interesting observation last summer whilst repairing an
automotive air conditioning unit. Conditioned air will register a cooler
temperature (on a vent mounted thermostat) with a medium fan setting as
apposed to a high fan setting. My theory is the evaporator can only
remove X amount of heat per cubic unit. The more hot air you force over
the coils the less they will cool.
        I bet the opposite is  true about heater cores. Try a medium
setting on the defrost fan and see if the output temp is higher.
        Also note that on some models the fan moves cold air from the
outside directly to the fresh air vents.

Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>86 VW crewcab;60 356B Coupe
For Sale: 61 AustinHealey Sprite(not Bugeye);Daily driver $2500

On Mon, 17 Jan 2000 08:03:12 -0500 Sharon & Miguel Calvin
<mcalvin@ICAN.NET> writes:
>On a long highway run last night the heating system behaved strangely.
> It
>was very cold outside, -20c or about -4f, and very windy.  The van
>never
>got very warm even with the heat and defrost levers in the fully open
>positions and the fan at max.  There was heat but not enough.  when we
>stopped for donuts I noticed that as soon as we got off the highway
>the air
>coming from the defrost vents started to cool down while the air from
>the
>footwell vents remained warm.  After being stopped for a few minutes
>with
>the engine idleing the defrost air was cold and the footwell air
>remained
>warmbut not hot.  The temp guage stayed in its usual position over the
>LED
>throughout the drive and the ten minutes spent stopped.  Anyone know
>what
>is going on here?
>TIA
>
>Miguel Calvin               ==+=========
>mcalvin@ican.net           /[ ][  ][  ]}|
>Guelph, Ontario, Canada   |  _       _  |
>83.5 Westy, "Frieden"     =-'O`-----'O`-= ~~
>1.9l H2O and manual trans

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