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That's probably a vacuum issue. The function switch sends vacuum to the various doors to direct airflow. If there is no vacuum, the default is defrost...
The function switch is the **** you trun to select floor, vent, or defrost. On the back of that is a multi-line vacuum connector. The black line is the vacuum supply line coming from intake vacuum on a gas engine, or the vacuum pump on a diesel.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
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