HVAC "Heat" Slider

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HVAC "Heat" Slider

Quarterwave
Hi everyone,

When I try to slide the temperature slider to the "heat" side of the spectrum, the lever is really hard to push from about half way. So hard that I can only get it into about 2/3's of the heat range.

Is this common?

What is the usual cause?

Thanks!
1985 Ford F150, 2WD.
351 H.O Windsor, aluminum heads
Cam: Lift = .496''/.520'' Duration @ .050: 224°/234°
C6 Transmission
6" Rough Country Lift
33x12.5x15 BF Goodrich All-Terrains
15x10" Pro Comp Rims
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Re: HVAC "Heat" Slider

ArdWrknTrk
Administrator
Do you have factory AC or a heat/vent only panel?
 Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with an Edelbrock 1826 and Performer intake.
Too much other stuff to mention.
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Re: HVAC "Heat" Slider

ArdWrknTrk
Administrator
The cable (solid wire actually) could be kinked or rusted in its sheath.
The blend door may have torn its hinges or something may be obstructing it.


That's about it unless the plastic quadrant or the sheath anchor on the control itself is broken
 Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with an Edelbrock 1826 and Performer intake.
Too much other stuff to mention.
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Re: HVAC "Heat" Slider

Steve83
In reply to this post by Quarterwave
It's relatively quick & easy to pull the glove box, heater core cover & core, and watch the temperature blend door move as you work the control:

Walk softly and carry a BIG SIX!!!
https://www.supermotors.net/registry/2742#album
Memphis, TN, USA, Earth, Milky Way
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Re: HVAC "Heat" Slider

Quarterwave
In reply to this post by Quarterwave
Ok, thanks everyone.

ArdWrknTrk - I have the factory AC.

Steve - thanks for the pics/links. Does the dash need to come out? I'm trying to tell from the pic in the link you provided and it looks like the dash is out.
1985 Ford F150, 2WD.
351 H.O Windsor, aluminum heads
Cam: Lift = .496''/.520'' Duration @ .050: 224°/234°
C6 Transmission
6" Rough Country Lift
33x12.5x15 BF Goodrich All-Terrains
15x10" Pro Comp Rims
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Re: HVAC "Heat" Slider

ArdWrknTrk
Administrator
"Quarterwave wrote
ArdWrknTrk - I have the factory AC.
With factory AC you only need to remove the glove box to get at the heater box in order to pull the core and see the blend door.
 Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with an Edelbrock 1826 and Performer intake.
Too much other stuff to mention.
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Re: HVAC "Heat" Slider

Steve83
In reply to this post by Quarterwave
Quarterwave wrote
...it looks like the dash is out.
I take pics when it's convenient while I'm working, but you only need to do what I posted above.
Walk softly and carry a BIG SIX!!!
https://www.supermotors.net/registry/2742#album
Memphis, TN, USA, Earth, Milky Way