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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 defrost vents? 1998 4runner.

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  • Cars & Trucks Master
  • 3,103 Answers

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..

Posted on Dec 08, 2013

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Anonymous

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Posted on Jan 02, 2017

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Anonymous

  • 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

mikehumble

  • 124 Answers

SOURCE: heater control 98 chevy s10 blazer

These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Posted on Dec 13, 2008

chuck943

Chuck Martin

  • 783 Answers

SOURCE: Vent control

You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.

Posted on Mar 02, 2009

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