LMC AC controller has too many detents

[Chris64]

I ordered the AC/heater controller to replace the one I have (which is missing knobs, scratched and just looks awful).

The problem is it has too many detents for the top lever. The label is correct, it has 6 sections, but 7 detents.

I'll try to get fancy with fonts to explain - When I slide the knob it snaps on too many places:

Stock
OFF A/C VENT HEATER BI-LEVEL DEF
X X X X X X

LMC Controller
OFF A/C VENT HEATER BI-LEVEL DEF
X X X X X X X

So that's weird, right? I'm not sure if this is going to work properly. I can just aim for the middle and ignore the detent, or I can probably use parts from this to make the factory one look new again. I'm just wondering if this is a defect or maybe not a big deal. I could even possibly modify it to have the proper detents.

On a side note: I always hated this control mechanism. Even in the 80's. Japanese cars AC controllers have always made way more sense to me. What if I want the recycle on/off with floor vent with heater on with AC on? Just because!

 

[ali_c20]

I have an original AC controller in my 79 K5 and I think there is a detent between vent and heat. Not 100% sure, I will check and report.

 

[legopnuematic]

1973-1975 HVAC control:

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1976-77

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Later is similar to 76-77 but minor changes.

 

[1lejohn]

I think the bottom one is for a later model truck. 80's version. It matters on the vacuum switch where all the lines come in that run to the plenum doors.

 

[Chris64]

This is what I have

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So six positions. The stock one for sure only detents on those 6 positions. The LMC just has this exact same graphic, but with 7 detents.