What is the metal pipe/hose that comes out to the thermostat housing?

2006 CHEVROLET EQUINOX
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CHRISMORRIS15
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What is the metal pipe/hose that comes out to the thermostat housing, it splits off the coolant reservoir and into the heater I assume.
Oct 10, 2024 at 2:03 PM
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STRAILER
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You are correct, here are images that can help clarify things. Check out the images (below). Please let us know what happens.
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Oct 10, 2024 at 4:01 PM