Hi all. If you've read my water pump post, you know I'm having problems starting the car. I started looking for vacuum lines I may have knocked off and found a possible candidate. Under the coolant resevoir are two lines. One is a set of wires that attach to the alternator. Right next to that is a rubber hose. What is that rubber hose and where does it connect to? Thanks in advance.

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1984 300TD Turbo 156Kmi
"He who seeks knowledge begins with humbleness" - Buju Banton