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the water pump has failed-replace the water pump and you will have your heat back,the finns are prone to rusting off

another possibility is that the switch that opens heater core to let in heat is broken. also check antifreeze level. if it is too low u will not get heat.

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โˆ™ 2015-07-17 17:45:50
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Q: Why is there no warm air coming out regardless of how long your 1999 Nissan Quest engine has been running?
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