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2004 Nissan Sentra no heat only when idling

  

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No heat when idling but when the car is moving it works well. what do you think is the problem

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Does the fan continue to run? Just gets cool when you come to a stop? Only time I ever had anything like this happen with heat was coolant level low. That will do it. And other cause was a failing water pump. Wasn’t moving water well at idle but at higher speeds it would. And for you I hope it’s low coolant cause changing water pumps on your car isn’t fun.


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