Question about Nissan Sentra

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2003 sentra no heat heater core has been flush and all kinds of troubleshooting. nothing works. where is this heater control valve at. they say at the end of the cable and all i hear is the door just flapping when you change the temperature. car has been running and not overheating. but no heat. please help

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  • Rudy Cordova
    Rudy Cordova Jan 05, 2011

    from the heater core, there are two hoses but nothing attach to it. the two hoses are connected to the engine where the thermostat at. i do not see any heater control valve between the heater core tube and the engine. do you have any picture or diagram where the heater control valve location.

  • Rudy Cordova
    Rudy Cordova Jan 05, 2011

    thank you

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  • Master
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There is a control valve under the hood. There should be 2 water lines that connect from the engine back tot eh firewall. They are about 3/4" in diameter and normally on the top one there is a valve that is either vacuum, wire or electrically controlled. If that valve doesn't open you have no heat. Since it is winter and you may want to fix the heat now and worry about fixing that valve later you can remove that and replace it with a piece or straight pipe. If that valve is working correctly the problem maybe your thermostat not opening or your water pump not circulating correctly however in most cases if either of those was the problem the vehicle will be overheating.

Posted on Jan 03, 2011

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