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Why does turning vent knob (defrost, mix, dash,floor,etc.) have no effect?

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Vent Type Selector Not Working - Jeep Wrangler Forum

www.wranglerforum.com/.../vent-type-selector-not-working-117541.ht...

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

www.fixya.com/cars/t26033235-turning_vent_knob_defrost_mix
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 ...

a/c problem fixed - ChevyTalk - FREE Restoration and Repair Help ...

www.chevytalk.org/fusionbb/showtopic.php?tid/27558/tp/1/cto...id/...
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?

Climate vent knob not working [Archive] - VW GTI Forum / VW Rabbit ...

www.golfmkv.com > ... > DIY + Maintenance + Tips/Tricks

Posted on Jan 02, 2016

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2005 Ford Focus. Air is blowing out of the floor vents and defrost vents but not dash vents. Also the knob will not go onto the dash vent option it's like it just springs back up.


A failure has occurred in the HVAC system, legally, when a fault happens the hvac system will default to defrost/floor. Further diagnostics will be needed to determine issue.

Jun 05, 2015 | 2005 Ford Focus

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What is the problem with my mode selection knob?


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Oct 03, 2014 | 2003 Kia Sorento

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How to repair


i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move

May 01, 2014 | 2004 Ford Crown Victoria

1 Answer

The switch/knob on my dash will not turn to the defrost or floor choices. I can only turn it from dash vents to dash/foot vents. Nothing past that. How do I fix it to where I can access at least the...


most of these are plastic and gum up over time..unless the cams in the back of it are already broken..try a touch of wd40 (lubricant spray) around and under the knob and see if it may be stuck..DO NOT FORCE COLD AS YOU MAY BREAK THE KNOB MOUNT if its really cold outside and you cant get it to work..buy a 12 volt fan that plugs into a cigarette socket and aim it at the windshield as a backup blower..walmart has these for 12-14 bucks and they will help keep the window clear...as long as the vents put out heat..most of the vacuum baffle controls are behind the glove box..under the dash..might need to experiment with the different controls to find the right one and stick it open..good luck..

Dec 08, 2013 | Cars & Trucks

1 Answer

The heat only come out the vents. I turn knob to defrost or floor and it does nothing it just stays on the vents


the selector knob or lever uses vacuum from the engine to open and close the doors that direct the air throughout your dash. check for vacuum leaks.

Dec 04, 2010 | GMC Jimmy Cars & Trucks

1 Answer

Heater/AC vent option knob produces knocking sound in back right corner. i.e. the knob rotates from vents in front to half front half floor to all floor to half floor half defrost to all defrost. the...


If I am reading correctly you are hearing the vent doors moving to redirect the airflow to the vents you choose. This is normal and can be more noticeable if the blower fan is on, putting air pressure against the doors.

Jan 09, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

A/C blows from defrost and floor vents, nothing from dash vents.


the switch where you turn it to blowing at your head is probably out. you will need to replace the switch control where your defrost, foot, head etc. what make, model, year is your vehicle?

Jul 09, 2009 | 1994 Toyota Camry

1 Answer

Cannot get heat out of floor vents -only defrost and dash heat


i had a simmiler problem on my 95 chevy pick up. on mine it would not chg. from floor to defrost, no matter where i put the selector. with mine it was the controls. if you go under solutions for k1500chevy gmc trucks it should tell you what your problem is, or give you an idea whats going on with yours.

Jan 12, 2009 | 1998 GMC Jimmy

1 Answer

Heater/AC only works thru defroster vents on '98 Contour


you prob have a vac leak on the back of the intake. good luck

Nov 21, 2008 | 1998 Ford Contour

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