More Recirculation Flap

Kneale Brownson knotnook at
Thu Feb 12 18:22:57 EST 2004

The flap you can see from the cabin is fastened to a set of arms that
shares a hinge with another set of arms that holds another door that seals
off the outside air from the evaporator box when the cabin door is open and
opens the evap box to outside air when the cabin door is closed.  There is
a little vacuum motor that is supposed to be anchored to another plastic
bar inside the evap box that may be disconnected from its anchor and
blocking the door.  The vacuum motor actually is just an expanding bulb
that pushes the door to the cabin open when the A/C is actuated or
something like that.  The spring is supposed to keep the door closed.  So
if the spring is intact, something is blocking the door, and if you can't
see an obstruction from inside the cabin, you need to look through the end
of the evap box after removing the rain diverter at the base of the
windshield.  There often are leaves stuck in there that may be restricting
the door operation.  You definitely want the cabin door closed during
winter operation so that warm, moist air from the cabin isn't being fed to
the air supply to the fan.  You'll probably need a mirror to inspect the
interior of the evap box because there's very little room between the
fender and the outside air intake opening.

At 02:33 PM 2/12/2004 -0700, Kerry Griffith wrote:
>I've got the non-closing recirculation flap behind the glovebox, yet my
>return spring is attached and functional. The flap won't close all the way,
>even if I press on it. No visible blockage, from the footwell. Does this
>indicate vacuum problem such as recirc vent motor/hose or intake
>manifold/vacuum reservoir check valve, or could it point toward some foreign
>object having wedged itself in the dark recesses?
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