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Discussion Starter · #1 · (Edited by Moderator)
Hello all. I am baffled and need some help. I recently bought a 2017 Acadia All Terrain with only 19K miles. It is in pristine condition. When I was washing it the other day, I looked underneath and noticed these channels welded on to the floorpan/frame on both sides. I know that models with separate rear A/C have refrigerant lines in protected channels leading from the compressor. I don't have rear A/C, and even if I did, the lines would only run along one side. The channels are u-shaped with lightening holes on the surfaces that face the driveshaft. Does anyone know why these are there? They certainly reduce ground clearance.
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I have the same channels, I would think they are essentially bumpers. I do have rear AC, but nothing runs inside them.
They appear to be just a tiny bit lower than the rest of the items under the vehicle (run your eyes across them, everything seems to be a touch higher to my eyes).
If you bottom out, crumple them up a bit; cheap and easy repair. Bottom out your exhaust or other items; not so cheap.
 

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Discussion Starter · #3 ·
Thanks for the reply! But I don’t see these as much protection for underbody components, If that was GMC’s intent, a real skid plate that ran the full width of the chassis would provide much better protection as it would protect the exhaust parts, driveshaft, and other centrally mounted items.
 

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This is a station wagon on steroids. A full skid pan is not something that probably 999 of 1000 buyers want (to pay extra for) or need.
Can't say for sure what the intent was, although a GM replacement parts site may list them with description.
 

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I had a notion to paint them flat black so they wouldn't be as noticeable.

I think they look like some sort of bob sled skis. . . . lol.

Maybe they're for keeping the Acadia going straight if bottomed out in deep snow> LOL
 
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Those bars under the vehicle prevent ripping open the plastic fuel tank, or crushing the HVAC lines when going over poorly built speed bumps, curb jumping, etc.
 
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