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  #1  
Old 09-21-2009, 06:01 PM
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Question 1998 Ranger...How can I fix my temperature control knob without removing the dash?

Probably a dumb question but I just don't know. Something has come undone behind the temperature control knob. I don't know if it is geared or controlled by some sort of rubber band - but it is completely loose and not working at all. My questions are: Is there some way to remove the black portion of the dash without having to remove the WHOLE dash? Does that part pop out, somehow? And what exactly is it that may have come undone? I'm hoping it is a simple fix...simple enough for this dummy! Thanks for any help and advice!




Mitch
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  #2  
Old 09-21-2009, 06:03 PM
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Pull the knob off and see if the back is split may just need a new knob

If you wanna remove the radio bezel there are 2 screws up above the control knobs reove them and pull out. Then there are 4 screws holding the the panel on

Using a 7mm socket, remove the 2 screws holding the radio bezel



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Last edited by STL; 09-21-2009 at 06:06 PM.
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Old 09-21-2009, 06:31 PM
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WOW! Thanks, Mykhael...that was a fast reply! I appreciate that very much! Hopefully, once I get behind there, it'll be an easy fix. I didn't even think that the knob itself might be split. I'll run outside and pull it off to see. Thanks again, man!

Mitch
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Old 09-21-2009, 06:41 PM
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Had a 92 Pontiac that the knob split and just turned

Better to start easy
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Old 09-21-2009, 06:49 PM
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No, the knob looks fine. I turned the stem itself with my fingers, and it still does nothing. I'll have to wait till tomorrow for some light to see what's what. Does that knob operate by some sort of gear or rubber band type thing? It's just not "catching".

Mitch
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  #6  
Old 09-21-2009, 06:51 PM
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Never have looked at it so I couldn't tell ya

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Last edited by STL; 09-21-2009 at 06:54 PM.
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Old 09-21-2009, 06:58 PM
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Thanks!
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Old 09-21-2009, 07:32 PM
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Some temp knobs control a motor electrically and some have a mechanical push/pull cable system. It varies by year and whether or not the truck has A/C or just heat. Either way, the knob directly or indirectly moves the Blend Door which adjusts temperature.

These are two versions of the blend door actuator motor controlled by the electrical type knob shown in Mykhael's picture above:


This is the push/pull cable type:


Going by the symptoms, I would guess that you might have the cable system but I don't know for sure.
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Old 09-21-2009, 07:47 PM
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I dunno...but if it helps any, my air conditioner will only work on the MAX/AC setting. But when set on A/C, only hot air flows thru the vents - as if it was set for heat. This started as soon as the temperature control knob stopped working.
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Old 09-21-2009, 08:25 PM
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It sounds like your blend door is currently open to the heater core airflow. When you select Max A/C, the hot coolant flow to the heater core is shut off by a valve in the engine compartment - that's why you get cold A/C in that mode.

The first thing you need to know is whether you have the electrically controlled blend door or the cable controlled blend door. It will be apparent which it is when you pull the HVAC controls out.
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  #11  
Old 09-25-2009, 01:39 PM
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Quote:
Originally Posted by STL View Post
Pull the knob off and see if the back is split may just need a new knob

If you wanna remove the radio bezel there are 2 screws up above the control knobs reove them and pull out. Then there are 4 screws holding the the panel on

Using a 7mm socket, remove the 2 screws holding the radio bezel
OK...I have finally gotten around to removing the black panel. I took the two screws out with a 7mm socket. Um, I need to be certain here: Do I now pry the panel off with my fingers? It's tight as all get out...and I'm afraid of "manhandling" it too much and breaking something, ya know?? I know that you said there are 4 screws holding it on--and that stumps me since I don't see the additional 4 screws. Having never done this before, I'm just being cautious. I'm now thinking you mean for me to remove the radio itself to reveal the 4 screws? Right?

Mitch
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  #12  
Old 09-25-2009, 01:49 PM
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You need to fully remove the radio bezel in order to get to the 4 screws which hold the heater/airconditioning control panel to the dash. There should be no need to pry the 'face' of the panel off.

As bob said earlier, I think you've got an issue with the cable operated blend door. To replace the cable unit, remove the knob, then I believe on the control side it takes a 1/4" socket, then twist the assy out of the control panel. At the blend door...I honestly don't remember what it takes to remove that side.
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  #13  
Old 09-25-2009, 02:02 PM
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I have the two screws off. This is a pic STL provided:
Does this just snap off? And is it called the radio bezel?

And yes, I reckon I'm one dumb f***....but a careful one at least Thanks to anyone who can help me with this one!

Last edited by MitchyMitch; 09-25-2009 at 02:39 PM.
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  #14  
Old 09-25-2009, 04:07 PM
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Quote:
Originally Posted by MitchyMitch View Post
I have the two screws off. This is a pic STL provided:
Does this just snap off? And is it called the radio bezel?

And yes, I reckon I'm one dumb f***....but a careful one at least Thanks to anyone who can help me with this one!
Yes the bezel pulls out after the 2 screws have been removed but it is sometimes a little bit hard to get it to release the first time it is removed. Under the bezel is the HVAC panel held in by 4 more screws.
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  #15  
Old 09-26-2009, 02:42 PM
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Quote:
Originally Posted by rwenzing View Post
Some temp knobs control a motor electrically and some have a mechanical push/pull cable system. It varies by year and whether or not the truck has A/C or just heat. Either way, the knob directly or indirectly moves the Blend Door which adjusts temperature.

These are two versions of the blend door actuator motor controlled by the electrical type knob shown in Mykhael's picture above:


This is the push/pull cable type:


Going by the symptoms, I would guess that you might have the cable system but I don't know for sure.


Finally got everything off without breaking something. I took pictures but will have to post em later. What I see is that everything looks JUST like this photo STL posted earlier:

So I guess I don't have the cable type. So my problem could be the Blend Door Actuators? I don't see those, so what else do I take apart? Can I access anything with the glove box door removed?
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