So I was under the hood last week topping off m oil (thank you NS) and I noticed this hole in the back behind my engine. It definitely looks like something broke off, and I have no clue what it is. I think it's effecting my heater. It only blows hot when I'm giving it some gas, and blows cold while idling. Please let me know what's missing, and what all it could be effecting. I attached some pics.
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