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gurgling sounds when heat is on

  

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i have an 06 nissan sentra 1.8l base model, 55k miles

im hearing a gurgling sound when the heat is on. what could that be? also the heat only comes out of defrost vent. not sure if that contributes to the noise. is this a cause for concern? thanks for the help scotty. 

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2 Answers
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Well, gurgling normally means you have air in the system so I would bleed the air out of the cooling system first

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ok thanks for the help scotty

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