well a couple weeks after i got my cavy i realized that when i turn the heat or air up above the first level it starts rumbling and shaking real bad.. i wasn't really worried bout it till now since the winter is rolling in and i need heat... my guess is it might be the heater core by the passengers feet because that's what feels like its shaking.. anyone know what it might be or how i can fix it without replacing the part?
i have a 04 cavalier 5spd base model if that helps
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