Hello all, on my 2005 tribute 4 cylinder I was replacing my 2 vacuum hoses that was caroded for my ac vents in the motor area and noticed a hose unhooked 'circled in red' I think I hit it by mistake with my big hand while replacing the front vacuum hose 'circled in blue' on the front of the motor but now I cant seem to find where it goes to?? I plugged it with a cap for the time being, Here's a pictues please help 🙏

 

Does it suppose to be plugged to the block or is it a breather tube???