Air vent selector switch doesn't change when turned, what should I check for? Turn from dash to defroster or floor it doesn't change?

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Oct 13, 2011 - 30 posts - ‎21 authors
It will not switch into upper vent mode, only have the option to have it all on my ...You mean the switch itself on the dash will not turn physically?

Turning vent knob (defrost, mix, dash,floor,etc.) has no - Fixya

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Turning vent knob (defrost, mix, dash,floor,etc.) has no effect. Posted by Jim Long on Jan 01, 2016. Want Answer 1. Clicking this will make more experts see the ...

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3) Mode of operation knob has no effect (air comes only to floor for example) 4) Rear defog ... The transistor is MPSA56 (bipolar pnp) and you can locate the faulty one easily. It is the .... With the switch turned only to Vent, no air from anywhere?

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Check air box if it won't change air flow some thing is wrong there inside the car

Mode door is stuck or broken .

defrost is the defalt mode look for a damaged vacuum line going ti the control head

Check under dash in duct system for any vacuum hoses blown off then check under the hood on the passenger side of engine compartent.If all hoses are connected then you will have to check the heater blend door actuator and the heater blend door lever for proper operation.

{: ) Check first the fuse labeled HVAC1 10A at the rear fuseblock. If okay, the mode actuator could be faulty. You can try this: turn ignition switch and a/c off for a minute. Then turn ignition on, wait forty seconds. Afterwards, start the engine, and check your a/c again.

there is a selector motor on the side of the heat ac coil box under the dash. it should have 2 or 3 levers on the side of it. it controls the dampeners the select where your air is moving to from the defrost to the bi level to the floor or all of the above find that control module and then turn the car on and start moving the selector switch back and forth slowly while watching that module if its moving the levers then you have a more serious problem and need to have a professional look at it. check to make sure that the levers are even connected and that the wiring harness is even hooked to the control module

The problem is probably a faulty diverter door actuator or vacuum problem at the HVAC plenum under the dash. This is a common problem - see YouTube for help diagnosing this:
https://www.youtube.com/watch?v=Nlt9A1sp-4U

THe blend door seems to be stuck. When you change settings from defrost to floor air or, vent, the blend door opens and closes directing the air to the place you want it to go to. I have had some success spraying a lubricating oil such as WD40 under the dash on the blend door. You need to get under the dash with a flashlight to locate it. It looks like a flap. Spray it with a couple of shots of the WD40. Go easy on the spraying as you may be inhaling the fumes. Keep the doors and windows open to minimize the fumes. Wait about 1/2 hour and try the A/C functions. (defrost, floor, vent air)

it all has to do with vacums basically, when you turn the switch to defrost there is a hose that should **** a "door" so to speak over lettin the air travel through your defrost vents, and if your not gettin suction the in aint gonna switch over, and are you gettin it out of the floor vents?