What Vacuum Hose is this ?? (See Pic)
 

Opened hood and heard loud Hissing noise for about a week. Finally noticed it was coming from the hose below. What effect would this Vacuum hose have ? Thx🙏!

Not sure but it might be for the blend door of the hvac system.

Check if yours will switch from floor, dash and defrost vents.

Exhaust valves

^^^This. It's the vacuum supply to the NPP vacuum tank. NPP may or may not work depending how bad the leak is.

Thank you guys! Now my next question....I have a Bassani Exhaust with no use for these vacuum lines.

Does this Vacuum now act as a vacuum leak since this hasn't been capped?? If so, should I pull fuses for exhaust AND capped these lines?

Cap the line at a convenient place and move on. Vacuum leaks are bad.:thumbs:

Agree! Agree!