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Why would your heat only work on defrost?

Updated: 10/21/2022
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15y ago

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ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?

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15y ago
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Q: Why would your heat only work on defrost?
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