Question about 1983 Nissan 280ZX

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Heater core and heater hoses

I have anti-freeze dripping on my passengers side floor board. Is it most likely to be a hose or a heater core? How in the world do you get to it? I have taken out the old radio and tape deck and some of the under dash on passengers side but I still can't reach it. Any help would be much appreciated.

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  • ggibson221 Nov 11, 2008

    Just had a heater core installed and as soon as water got hot... the
    antifreeze leaked out on passenger side. I can see a stream of it when
    I start car. I have a puddle of this green stuff on the passenger floor
    and the guy who put heater core in says the heater core is not the
    problem. What didn't he do right? What needs to be done to
    correct problem?


  • Anonymous Mar 22, 2014

    bubbling noise from under passenger side of dash



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Beig there, done that.
most likely is not the heater itself. most of the leak is from the water **** (heater control valve) located at the passager side of the heater. if you need instruction e-mail me at, I have all the instruction and diagrams for the thing.

Posted on Sep 30, 2008

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THe heater core is a bear to get to. You have to practically remove the entire dash to get it out. A cheap way to try and remdy the problem is to use Alumaseal. Alumaseal can slow or end the leak but it is temporary. If you remove the heater hoses and bypass like the previous answer you lose the ability to have heat in the car and you mess up the cooling system. Don't bypass. IF you are mechanically able I would try and do it myself. I have done them. Figure a day worth of labor to do the work. Lots of screws wires and ****. Once the core is out you may be able to have it fixed at a local radiator shop. Otherwise go to local supplier and buy a new one. Take your old one with you to verify correct one. Look for part at a local radiator supplier. Good luck.

Posted on Aug 14, 2008

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Mine had the same problem and I didn't have the time to replace the heater core, so I disconnected it and the leak stopped.

Posted on Jul 14, 2008

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