Not an engine guy.

rbarrios said:

Isnt that one of the horns?

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JayTee2019 said:

It is the horn ..
The pic below shows how I modified the bracket so that the horn points downward like the horn on the right side od the engine bay.

In 2020 onward it is mounted downward.

No idea why they had that left horn sitting like it was on 2017 to 2019.

Every time I opened the hood I couldn't stand how ridiculous that looked.
View attachment 12720

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‘17AcadiaDenali said:

Thank you for replying. It’s interesting how on every picture I’ve seen of the “Horn” including the one you sent there is an actual Horn shape to the component. On my Denali and the picture I originally posted it is just a black hockey puck shape with no “Horn” shape to it. 🤷🏻‍♂️. I appreciate you & your reply.

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JayTee2019 said:

I agree. It doesn't look like a horn in your picture because they mounted it with the "horn" face pointing down.

When I remounted mine, I turned the horn around on the bracket and bolted it to the bracket in the position shown in my picture.

Weird that they did that for 3 years then changed it on +2020 models.

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‘17AcadiaDenali said:

Hi
I just bought a ‘17 Acadia Denali and have a question. Forgive my ignorance, but what is the rust looking circular component to the left of the oil filler cap? Not a picture of my engine, but have the same component. Thanks in advance. View attachment 12710

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