EXPRESS VAN COOLANT LEAK - WHAT IS THIS PART?

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I have a small RV on a 3500 express chassis. I noticed a small coolant leak which only occurs when the engine is running. I located the leak and it appears to be coming from a tube that runs from the thermostate housing (I think) and disappears under the air intake. The tube is grey, metal and and about a quarter inch in diameter. Can anyone tell me what this is any how dificult it is to replace. The engine is a 2004b 6.0l, v8 and only has 9000 miles on it. Thanks in advance

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Friday, April 20th, 2007 AT 5:00 PM

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