1998 GMC Sierra leaking water

JOMAMA

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Can someone tell me what the 90 degree rubber tube is directly to the left of my heater core lines in this picture?

https://plus.google.com/u/0/photos/1...96791781140289

When I got home from a 3 hour drive last night water was leaking from this tube. I did not run the air conditioning at all and the radiator was still pretty much full. truck was not running hot at all the whole trip?
Thanks in advance for your help.
 


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