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94 jeep grand cherokee when put on defrost doesn't blow from top of dash it blows out of floor vents. where is defrost damper located? Picture or diagram, if you have one wood be helpful
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the damper or flapper ibside the heater box is not moving. If they are vaccum actuated could be lack of vaccum or bad diafram in the actuator...replace
its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash
behind the center counsel between the floor and the heater housing is a part that is called the blend door actuator. these usually go bad and have to be replaced.
There is a vacuum leak under the hood somewhere. Check the vacuum at the speed control servo. If there is no vacuum on the line with the engine running, follow the line to find the leak. The vacuum reservoir is mounted under the battery tray. I would look in that area after confirming no vacuum at the servo.
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