Quote:
Originally Posted by sugarwood
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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Default would be lever down and flapper vent closed but re-direct ports open.
If flapper vent is in open position and levers do nothing then the cable is most likely broken or came off the fastener at the box.
Lube is part of it but sometimes the cable stretches and does not fully close the flapper.
One has to get under the car and ask a helper to raise and lower the levers and and observe the flappers. Up the ports are closed and vent is open and heater motor should be running, if with foot blowers those will run too.
Lever down the ports are open ( ports I mean the three triangular holes ) vent is closed, heater motor should be off.