Wade Nelson Posted April 6, 2012 Share #1 Posted April 6, 2012 Knob on the dash below my ignitions switch, little do-hickey that sez "pull down to open."to open WHAT? Link to comment Share on other sites More sharing options...
Wade Nelson Posted April 6, 2012 Author Share #2 Posted April 6, 2012 from another thread:It's the vacuum control knob. When the A/C is on or in the vent position, when it's open you have 85% air flow to the upper vents and 15% to the floor and when it's closed you have 100% to the upper vents and none to the floor. When the heater is on it has no effect. Link to comment Share on other sites More sharing options...
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