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Is this how it works? The default position is for the flapper box vents to be open. This allows hot air to escape outside. When the lever is pulled up, the flapper box valves close, and air is directed into the cabin. The red lever also closes the heater blower circuit.
If the flapper valve was stuck open, wouldn't the red levers also be stuck? If not, doesn't that mean the cable is broken? I don't see how it's just a case of lubing the flapper box.
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1986 Bosch Icon Wipers coupe.
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