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More than likely the heater core is leaking.

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14y ago
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Q: Is the heater coil going bad on my 2001 ford f 150 if I smell antifreeze coming through the air vents if I turn the air controller to off I do not get the smell anymore?
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Why is there a smell of antifreeze and white smoke coming through the vents of your 1997 Toyota Camry?

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