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I think you're talking about the heater pipe. It's probably going somewhere where the heater hoses are. Either that or it goes to the block. My LQ1 in my Cutlass has a pipe like that going from the lower radiator hose to under the intake plenum. Very strange setup but it is what it is. When the engine is cold, follow it and see where it goes.
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2̶0̶0̶3̶ ̶P̶o̶n̶t̶i̶a̶c̶ ̶G̶r̶a̶n̶d̶ ̶A̶m̶
1994 Olds Cutlass Supreme
2̶0̶0̶2̶ ̶C̶h̶e̶v̶r̶o̶l̶e̶t̶ ̶C̶a̶m̶a̶r̶o̶
1996 Infiniti G20
1993 Chevrolet Lumina Z34
1989 Buick Regal Limited
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