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Ford Truck Club Forum > FORD BRONCO | BRONCO II > 1980-1986 Ford Bronco



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  #1  
Old December 3rd, 2011, 06:06 PM
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Default Heater won't switch from vent to defrost

OK this has been bugging me since I got the Bronco and now it's getting to be annoying, the heater won't switch from Vent to Defrost you can hear the vacuum "suck" the flap to change it shut but it doesn't change it just keeps blowing out of the Vents, it'll fog the windows up and not unfog them so seeing becomes a hazard. I've been told to take the glovebox out and check the vacuum connections but there isn't any to check, there are hoses but there is no connection there. I even switched the little black ball that is mounted on the inner fender from a 1 vac port to a 2 vac port and plugged it in directly to the vac tree on the firewall and then the heater vacuum hose coming out of the heater box to non avail.

Any Help??
  #2  
Old December 3rd, 2011, 06:52 PM
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could be that the blend door is stuck with trash (leaves) or has a broken hinge


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  #3  
Old December 3rd, 2011, 08:00 PM
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I would pull the cage for the blower motor and the wiper cowl and all the air ducts easily accessible and clean em. If you get the blower motor out get a shop vac in there and snake it around.
Squirrels love cowls and that little cage holding the blower motor for nests.
  #4  
Old December 4th, 2011, 11:04 AM
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you can get to it behind the glove box
than unbolt the motor and see what alls in there and you can also check the door then


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  #5  
Old December 4th, 2011, 11:45 AM
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Will do when it is a tad warmer out.
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Old December 4th, 2011, 01:03 PM
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I know this is a bit off topic, but has anyone else noticed how when the weather gets cold and miserable and the hours of darkness are a week longer than the daylight hours, anything that can go wrong with a vehicle will go wrong?

The suggestions above, about debris being in the way of the flap is what I was going to mention. If you park under trees with small leaves, they can work there way into the ventilation ducts, or some rodent may have built a cozy little nest in there. Whatever you find, before closing it back up, a couple drops of 3 in1 oil (or some other light oil) at the hinge points will make it slam shut when you switch from one mode to the other! :twothumbsup:


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  #7  
Old December 4th, 2011, 06:56 PM
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It's all nice and clean, the flap shuts and everything, I did find this though:

There is supposed to be 3 hoses going to it evidently, all that is there is 2, and a partial hose on the rear:

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Old December 4th, 2011, 09:17 PM
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yep looks like somethings missen


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  #9  
Old December 4th, 2011, 09:42 PM
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Anybody know WTF this is for??? I can't find it in my Chilton's or Hayne's manuals and I've only got a Ford Engine Shop Manual.
  #10  
Old December 5th, 2011, 09:35 AM
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if the third hose is nonexistant try a cap/plug on the port and see what happens
you can get a pak of rubber/plastic vacuum caps from the auto store


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3rd-coast-thumper , BigBlue79 , BigT67 , Booba5185 , DoubleDee , F150GT , glc , icepicker , JedCrone , JJones , JohnJ0218 , JSoko , Klitch , marmaduke , pappywith4 , Russo2

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defrost , heater , switch , vent

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