If you smell anti-freeze, I'd say you have a leak
03 Chevy avalanche
I love my avalanche but it has problems with heating like the blend door just quit working and started smelling antifreeze in cab yesterday, unhooked battery to see if it changes anything , nothing so I'm assuming clogged heater core or blend door , help lol.
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I'd flush the heater core and test it for leaks
Yes it could, that leak would show under the hood.
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