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It appears your blower motor is not working correctly on your 1980 Cadillac Coupe Deville. The vents are for both AC and heat. You may also be losing vacuum pressure. If you cannot find the source, your mechanic can help you do so.

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Q: Why on your 1980 Cadillac Coupe DeVille the air condictioner is blowing the air out of heater vents?
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