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I believe they are internal. Yet again, leave it to gm. The black hose shaped like an L connecting the black air filter assembly to the engin block serves the engine ventalation purpose. I think. I had mine off, the suction going into the engine block is really low for some reason. Make sure you get the right one, the one next to it contains coolant and can burn you. If it connects to the air filter, you found it. For kicks and giggles, I have sprayed mine out with carb cleaner. seems fine but still barely any suction.

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15y ago
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