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Hood Automotive tire Automotive fuel system Motor vehicle Automotive care

Chasing down a vacuum leak today on 2002 1.8 auto, I noticed this hose under the coolant reservoir. It is quite flat in the middle. Can any of you kind peeps tell me specifically what this hose is? Thanks in advance.
 

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PassatWorld Elder
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It goes to the vacuum reservoir and eventually the leak detection pump. It will cause a large vacuum leak and can set a code for the brake booster.
 
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