What is this bolted to my heater core/AC box?

[TWeatherford]

I'm thinking this big plastic thing is my heater core/ac box. It has this small thing bolted to it, which doesn't appear to do anything. Maybe its a vacuum pod? That was never hooked up? (Its all covered with spray adhesive where I put insulation on it in the past. Thats why it looks nasty.)

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Anyway, if I eliminate it it will give me a lot more room for my turbo. Thought I'd ask first in case it does somehow actually do something. Thanks for reading.

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[79jasper]

Definitely should've had a vacuum line hooked to it. Lol
But I guess you can go without it, I mean if nothings been hooked to it since you've had it.

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[Dsl_Dog_Treat]

It's a vacuum reservoir for the hvac controls.

 

[TWeatherford]

Thanks for the replies. Where does the line that's supposed to hook to it connect? I'll either relocate this one or just make another and stick it somewhere more convenient.

 

[79jasper]

The vacuum manifold where the other lines are, and I think may have had a tee near that box that went over to the other side of the box.

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