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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Re: air controls for solecter bar are at dash only
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
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You just THINK the flaps are working, but apparently the top vent is not. These multiple flaps are controlled by vacuum and you have a line off to that particular flap. This means the flap won't open and the vacuum leak, whether you can hear it or not, is making you lose MPG also, though slight. The vacuum line could be cracked or disconnected from the flap or at the vacuum block on the back of the lever unit.
You most likely have a vacuum leak not allowing the vacuum operated vent/duct inside your instrument panel to operate. Check all of your rubber vacuum hoses in the engine compartment for leaks, cracks or breaks .
likely to be a vacuum problem from the engine compartment to the thing that controls all the heater flaps in the dashboard .. thin hard plastic pipe from the passenger side of the front of the engine compartment to passenger cabin tends to get fragile with age/chafe somewhere and break/chafe a hole, you lose the vacuum to the actuating flaps & then air doesn't come out.
fairly easy to replace as long as you use the original pipe to pull the new one through
Vacuum supply starts on the drivers side of the engine. There is a vacuum line going into the brake vacuum assist from the manifold. branching off of that line is a double line that snakes under the intake manifold, behind the valve cover, along side the valve cover on the passenger side headed to the front of the engine. Then it curves to the right side of the engine. One set of hoses from this line goes to a valve control (red and green i think). The other line goes to the vacuum storage ball, it should be black. The vacuum circuit continues out of the ball in another black line that snakes into the firewall. It goes under the heater core black box and disappears under it. Now go into the passenger compartment and drop the glovebox. look to the back right you will see a black and a white vacuum line coming out of the firewall. The black line is your vacuum supply from the engine. It goes up to a little rubber manifold. disconnect the lines coming from the dash switch and check for vacuum on the manifold where the black line is going in. The white line controls the cabin air intake under the glovebox and the thermostat shutoff under the hood. It should only have vacuum when the switch is in a certian position, AC probly. The other three lines coming off the rubber manifold snake behind the dash vent door assemble and come out near the gas peddle. The red one controls the dash vent. apply vacuum to the red hose and see if the vents go to the center dash position/AC. The yellow and blue? ones control the floor vent control near the gas peddle. yellow gives you half floor and half defrost. blue gives you all floor. you can use a small vacuum line to connect the black vacuum supply to each individual line on the manifold and check the function of each vacuum control assembly individually. I hope this helps. On my truck each control unit works fine when i apply vacuum to them individually but when I hook the dash switch up to the rubber manifold it goes to defrost. I tried changing the dash switch and the lines running from the switch to the rubber manifold and the vacuum ball under the hood, nothing works. I suspect I may have leak i just haven't found yet. next step is to get a vacuum gage and start checking the amount of vacuum i am getting at each vacuum line. I'm sure it is supposed to be getting a specific amount of vacuum and will not work if the vacuum drops below a certian level due to a leak in a line somewhere? God bless.
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,
This can only be 2 things. 1. Your selector switch for the vent controls is defective. 2. A vacuum hose that powers the vent is undone under the hood or dash. There is a 3 but could happen. Your vent door on the floor board is stuck. Check all 3 and let me know if I can help you more and thanks for using FixYa.
Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.
Check the plenum door motors (vacuum controllers). When you move control you should see each of them move. the one that does not respond is the one that isn't working. Check hose that feeds it as well if no vacuum there switch control is bad.)