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99 Camry: air flow control knob stuck on vent, won't move to defrost

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: There is no air flow

You need part GM Part number 89018675 or ACDelco 15-73596. The Mode Selector Actuator. What happens is the part is a CHEAP part POORLY designed and when it goes to turn the flaps inside the HVAC unit its the plastic gear slips instead of turning the flap!!!

Just to forward you you might want a deal to install this art for you unless your good at fixing your own vehicle, because you need SMALL sockets and a lot of patience to get this part in!!!

The part is ALMOST directly above the steering shaft for your steering wheel, so theres a lot you got to remove before you will even see them!!!

I only recommend you to have a dealer put this part in for you, unless you have your own service manual!!

Because there is 5 of these darn things and if you pick the wrong one you will have to do it all over again!!!

3 on the Drivers side and 2 on the Passengers side!!

But replacing this part SHOULD solve all your problems!! AS it did for me and i was having the same issues as you have described!!


Posted on Jul 22, 2008

  • 29 Answers

SOURCE: 2004 Chevrolet Silverado vent control

sounds like the vacum lines thats hooked up to it is disconnected check that first

Posted on Oct 30, 2008

philriden
  • 146 Answers

SOURCE: 1998 Mustang - AC blows only through Defrost vents

You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

Posted on Jan 05, 2009

maygemini
  • 147 Answers

SOURCE: WILL NOT SWITCH AIR FLOW STUCK IN DEFORST VENT

when your car is in defrost it has an ac cycling it removes the moisture then sends the air over the heater core depending on how warm you set it you can feel warm or cold but the ac is always cycling...ridding the moisture...you need a good ac tech it will be okay...its just expensive going into the heater core if needed...!

Posted on May 07, 2009

  • 1 Answer

SOURCE: AIR FLOW STUCK IN DEFORST VENT WILL NOT SWITCH TO FLOOR OR AC VEN

I found a broken vacuum hose on top of the intake which runs the controls

Posted on May 30, 2009

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1 Answer

My air runs cold but is stuck between defrost and front vent. How to fix


Pull the control panel out of the dash and see if the mode control vacuum switch has a good vacuum source or the switch itself leaks vacuum. The mode control is what moves the doors that diverts the air flow around to the vents, defrost and floor.

Sep 20, 2016 | 2004 Hyundai Elantra

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99 air conditioner switch


im not sure what fails here.
no air, from all vents. no cold air , no hot air.
tell me what you want.? hot or cold air. (or defrost)
does the blower blow on high?
did you check all fuses. 1st.
if real serious. on DIY repairs, try the FSM.
or a great subs. alldata.com

Jan 01, 2014 | 1999 Toyota Camry

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Fuse diagram 1996 grand prix


On a 1996 model you probably have vac actuators that control air flow. Look under the dash and you may be able to see the actuator that controls flow to the defrost and vents. There would be another one for temp control.

Jul 02, 2013 | Cars & Trucks

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Air regulator valve on dash for heat and AC stuck in on position. Ram 2500, 2004.


The most common problem is a stuck or faulty blend door under the dash.

Feb 22, 2013 | Cars & Trucks

1 Answer

The blower on my a/c on 2002 chevy trailblazer only blows from the floor vents and the defroster vents but not the dashboard vents how can this be fixed. Also, it only works on 5


It sounds like you have two problems. First a question though; Is your heating and air conditioning control on the dash automatic (has two knobs that rotate and a display screen in the middle), or manual (has two levers that move up and down for driver/passenger temp and a separate fan knob and mode knob).

In response to the vents being stuck on defrost and floor, from experience i can say that the most likely cause is the mode actuator has failed. If your battery has recently gone dead, that could have brought the problem to the surface. When the battery has gone dead, the heating and air conditioning controls relearn all the positions of the actuators behind the dash when the vehicle has been re-started. If there is a position sensor failing (which happens quite often) in one of the actuators, the heating and air conditioning controls won't be able to learn the correct position of the actuator and (in your case) defaults to the defrost/floor position.

The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.

Aug 05, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

The knob that controls the doors to the HVAC vents is stuck


TRY CAREFULLY DISCONECT THE CABLE AT THE BLEND DOOR AND 1. TRY WORKING THE KNOB,
IF WILL NOT MOVE YOU NEED A NEW CABLE.
.2 GENTLY TRY MOVING THE BLEND DOOR BY HAND. THIS SHOULD GIVE YOU THE DEFROST FOR NOW. IF IT WON'T MOVE YOU SHOULD TAKE IT TO A GOOD SHOP THERE ARE A LOT OF SMALL AND EASLY BROKEN PARTS IN THE HEATER BOX. A DAMAGED BEND DOOR ALLWAYS RUINS THE CABLE SO IT WOULD NEED TO BE REPLACE TOO.

Oct 20, 2009 | 2006 Toyota Corolla

1 Answer

Air flow to defrost


your heater,defrost control modular needs to be tested for funtionallity

Oct 06, 2009 | 2001 Chevrolet Silverado

2 Answers

The knob turns on the vent control but it does not change the air


you need to check the control wire is`nt broken most likely come out from flap connection just reconnect and it will work again,check the flap affected for free movement as could be jamming.

Jul 10, 2009 | 2000 Ford Focus

1 Answer

No heat, when I turn on heater- all cold air flows out


sounds like you have a stuck blend door in the HVAC system. If its not controled by vacuum the servo motor is bad or the vacuum line is bad. This door moves back and forth to go from vent to floor to defrost. and you have one to go from cold side to hot side. Hope this helps you

Jan 17, 2009 | 1999 Buick Regal

1 Answer

Air flow weak when set to heat


check for dirty cab air inlet or "HVAC" filter, or heater core is plugged from debris and air is being restricted and wont blow through. it works like a radiator, air ducts can also be getting stuck.

Jan 06, 2009 | 1983 Toyota Camry

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