[200q20v] Re: Sheeza HOT, Sheeza COLD cont'd

Kneale Brownson knotnook at traverse.com
Mon Dec 24 12:53:13 EST 2001

Actually, if you look at Bentley pages 87.27 through 87.30, you'll see
there is a temperature regulating flap WITHIN the heater core box that
directs fresh air over the heater core to warm it or not to provide
outside-temp fresh air.  It's controlled by a "temperature flap regulating
servo motor" .    Additional flaps within the heater core box direct the
fresh or heated or conditioned air to the instrument panel, defroster vents
and footwells.  There's even a special tool, or template,  #2076A, for
assuring proper alignment of the various flaps in the heater core box when
reassembling it.

The flap you discuss here is the one at the evaporator box.  Its function
is to open a flap into the cabin  during A/C use to let previously cooled
air into the blower system so the A/C is working with progressively cooler
air.  When A/C is not in use, the cabin flap is closed and fresh air enters
the HVAC system through the door to outside in the evaporator box.

At 09:31 AM 12/24/2001 -0600, Dale McCormack wrote:

>The only flap on the blower box that I know of is to affect the air source
>traveling into the heater core thence back into the passenger compartment.
>This flap is located in the passenger footwell and is a source of occasional
>problems (related to the linkage) with the Type 44, however it isn't
>intended to affect temperature. When  the flap is open air is drawn from the
>passenger compartment, when closed it brings in outside air.  I  guess if
>it's cold enough, there could be some effect on passenger compartment air
>temps, but not the "mood swings" you've described.

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