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HVAC mode manual mode selector experiences resistance


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azurite2005
Novice

Mar 29, 2021, 4:12 PM

Post #1 of 7 (806 views)
HVAC mode manual mode selector experiences resistance Sign In

2004 Chevy Silverado 1500 4.8L 4WD base model.

On my chevy dash, there are three HVAC knobs:
Temperature, mode, and blower speed.
This truck does not have AC. Temp and mode knobs have cables connected that dive somewhere behind the dash.

Symptoms: The dashboard HVAC vent mode dial was cracked.
I replaced the knob. When the knob is turned between various vent positions, I could here the vent door change positions, however, there was heavy resistance. After turning the knob a half dozen times, something in the cable assembly behind the knob broke.

I am thinking that in addition to replacing this cable assembly, I have a mode door or mode door actuator problem. Any suggestions on how to proceed? I am not sure which parts of the interior to remove to get at these issues, or how to efficiently diagnose what is going on.

Thanks in advance.

Jon


(This post was edited by azurite2005 on Mar 29, 2021, 4:17 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 29, 2021, 4:40 PM

Post #2 of 7 (796 views)
Re: HVAC mode manual mode selector experiences resistance Sign In

If you replaced the cable did you manually move the door lever to see if it moves freely?

You could have also jammed the cable to make it bind.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



azurite2005
Novice

Mar 29, 2021, 6:28 PM

Post #3 of 7 (784 views)
Re: HVAC mode manual mode selector experiences resistance Sign In

I have not replaced the cable. I am not sure how to access the "door lever"?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 29, 2021, 6:31 PM

Post #4 of 7 (782 views)
Re: HVAC mode manual mode selector experiences resistance Sign In

Look under the dash and follow the cable. You may or may not have easy access to it.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 30, 2021, 1:14 AM

Post #5 of 7 (770 views)
Re: HVAC mode manual mode selector experiences resistance Sign In

Jon,
Try to go back and see how panels come off so you can pull on, no doubt a control head for HVAC. Ha - dash diving is and can be what that is.
I haven't seen much that NEW with no factory A/C so just suspect you have a rubber coated cable case and a wire inside? Yes - like for a dang lawnmower.
That knob probably busted from being hit by something may have pushed that back + lost it's hold-down for the cable's case or harmed it.


When or if you can see it, it should be clear what you need to do either auto part stuff or literally like a yard machine fix.
The hard part IMO is if the HVAC head is busted beyond help a used one will be real tough to find that's still good if only for parts by about now a "pick your own" type place or use your judgement on what items to find if a screw and hold-down bit of metal that holds case also adjusts it's motion?


Side note: Trucks or cars about north of I-90 in US lost about 20+ years ago purposely folks bought NO A/C more it's costly and needed a whopping 10 days a year if you just wanted it to be a work truck just no point in A/C that just complicates a truck or car for many,
T



azurite2005
Novice

Mar 30, 2021, 3:02 AM

Post #6 of 7 (765 views)
Re: HVAC mode manual mode selector experiences resistance Sign In

Yeah, I bought the truck after it was a work truck for someone else. We are in NW Oregon, so just benefit from AC a couple months of the year. The cables do resemble a lawn mower rubber-covered throttle cable.

When I follow the cable under/ into the dash it seems to head somewhere to the right of the driver's side. I guess I will try accessing the area to the right of and above the foot pedals in hopes of getting a look at the mode actuator. I am hoping that I can test the mode vent door mechanism. Perhaps that means removing the mode actuator and turning whatever mechanism the mode actuator connects to?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 30, 2021, 4:12 AM

Post #7 of 7 (761 views)
Re: HVAC mode manual mode selector experiences resistance Sign In

The "heater box" will be up over passenger's feet, looking up. Cables were the rule (old phart here NE US) work trucks pointless to complicate. It's almost exactly what you'd find on a lawnmover - machine for a throttle or choke cable if like I'm thinking.

Another check: Since the knob was the first thing it should be indexed to a metal round pole with one side cut so it only fits one way.

If that was hit with a knee or stuff inside they bust. If that pushed in there's where I think it would bust.

Mirrors and lights - see what you can see. You might get a good view up under then over gas pedal towards the controls?

A maybe you can see it try to turn up under passenger's side.

Hammer is great with diagrams if nothing find a junkyard with one already torn apart see how it's done was my common trick it's already apart for one thing if there's a place you can do that include similar vehicles to this the full size GM trucks include Suburbans, Tahoes, GMC's ones and the like,

T







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