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Q: why does my heater blow cold air when my engine is idleing?
on 2004 Nissan Altima

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when i let off the gas my heater starts blowing cold air no matter when where or how it always does it
(2) Answers
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ck coolant level 1st the poss sluggish blend door. scan codes and try blend doors with a scanner to make sure doors are operating properly
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