Question about 1981 Ford F 150

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Air controls for solecter bar are at dash only

No mater where the the bar is air only comes out the panel vents.the vacuume switch is working because i can see +hear the arms that move the doors to switch them. do i have to take that whole duct work out, or can i do somthing else?

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It is Possible that the Blend Doors Are Moving but Possibly not far Enough and Also The Vacuum Diaphragms that do the Work Do get Dry rotted And Leak My Opinion for A Vehicle @ 28 yrs Old Can to have A Little Rotted Rubber.My OLD School Test For this was to Take A Small Hose Connected to Manifold Vacuum as A Test Hose and Check Each Port On the Selector Module (After Removal of it) to Check the BLEND DOORS this is A Last Effort Before Having to Take The Whole Assembly Apart.AFTER THIS I would Say that YES It would take some disassemble to Track Down the Problem. I Realy Hope this Leads you The Problem . Hopefuly it is a FixYa For you Have A Good Evening. rejakwilson

Posted on Feb 04, 2009


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If you cannot change the air flow from the heater vents, defroster vents, to dash vents, etc. as your control switch indicates the problem could be a loose vacuum line. It could have come loose from the engine under the hood. If not you will need to remove the control from the dash and check for vacuum at the control. If you have vacuum there you will need to replace the switch,

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