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Mystery Plug

552 Views 2 Replies 3 Participants Last post by  Ravalli Surfer
I was under my 05 Trailblazer LS doing doing an oil change when I noticed this loose plug.
Hand Automotive tire Gesture Finger Reptile

Automotive tire Tire Hood Bumper Vehicle

I have no idea where it goes. or what I plugs into. it has old grease all over it so it has been unplugged for awhile but I never noticed it till now. I'm hoping someone can steer me in the right direction to getting this annoying issue resolved. Once I know what this is for or some general idea I can go about cleaning and reinstalling if it severs a necessary enough function. thanks in advance for any advice and help
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It lo-o-o-oks "vacuum"-ish.
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