i was checking Trans Fluid and noticed this grey tube/hose. It was just sitting there but I couldn't figure out where it came from. The red pen in the photo is just for reference.
I am pretty sure that connects to the heater shutoff valve in the heater hose line. It is used to completely shut off coolant flow to the heater when you have max AC on.
Yes that is for you HVAC controls.
In goes onto the black think right be hide your oil fill cap.
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