Power running boards have a on / off switch on the dash under the HVAC controls. I have them on my '11 Tahoe.

 

I pulled the fuse to get the running boards to STAY IN all the time.


Well, the vehicle is for Mrs. Cusser to drive when she needs to take a horse somewhere, and she also feels it's safer when she has a dog with her; so she puts 99% of the hours with it, and doesn't like the auto-extending feature.

That said: I just revisited both the 2011 and 2014 PDFs of the owners manuals, and I don't see a word about running boards or power running boards in either manual. Maybe when it's warmer outside I could take another look at the vehicle, but if one could post a photo with an arrow or a finger pointing to such switch, that might help.

Yes, I can program a VCR. Yes, I have a Flip Phone. Yes, I have five 4-cylinder vehicles, all manual transmission; 3 have carburetors, 3 can play cassettes....

 

Update: Mrs. Cusser arrived back from the store with groceries, and after carrying them in (no, I didn't carry Mrs. Cusser in), I took a look-see. Yes, under the HVAC controls, between two accessory power outlets, are a few buttons, like one to change pedal height, and the button on the right seems to have an image of running boards on/off. I guess one is supposed to just find and know what these all mean, and I took a second look in the manual afterwards and STILL cannot find ANYTHING about the button location or operation in the owner's manual. So I think I'll just leave everything as it is. Thanks for the help.

Remember: a decade ago with our 2005 Mrs. Cusser thought a warning light on the dashboard was a submarine, it was an engine with a fan blade. And when we couldn't open a rear door from the inside, thought a diagram on the rear jamb was a spaceman; it was a kid, like to disable doors from unlocking from inside, my daughter must've kicked it on..

 

Page 2-14 in my owners manual.
Power Assist Steps The vehicle may have power assist steps. The switch used to disable the power assist steps is located on the center console below the climate control system. The power assist steps automatically extend from beneath the vehicle on the side in which the door has been opened. Once the door is closed, the assist steps automatically move back under the vehicle after a brief delay. The vehicle must not be moving for the assist steps to extend or retract. The assist steps cannot be disabled in the extended position.
I'm not home with my truck but thats the button you described. Button in is off, out is on. Button only has slight movement.

 

Of course !!! "Power Assist Steps", not running boards or power running boards !!! In Section for "Keys, Doors, and Windows", why didn't I think to look in that section, as that surely a power assist step would be a key, door, or window; so in 2014 manual on page 2-12.

So I couldn't resist looking in the 2104 manual index for Power Assist Steps or Assist Steps - NOT THERE EITHER !!!!

Thanks for solving this minor mystery, was tougher to solve than a Lifetime Christmas movie !!!

 

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My 2007 Chevy Tahoe started doing this it eventually the coolant got so low the vehicle started to run hotter I'd have to keep adding coolant well I changed the coolant reservoir because it was leaking from somewhere directly underneath like what you're talking about so I purchased a new one and installed it the vehicle will still warm when I topped off the coolant went for a short drive roughly 5 mi or so after parking the vehicle and inspecting for leaks I noticed again fluid leaking underneath the new tank I just put in wondering if maybe I added a little too much to it considering the vehicle was already warm from roughly 2 hours prior