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Thread: heater core hose popped last night

  1. #1
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    Jun 2011
    kona hawaii

    Default heater core hose popped last night

    I replaced my heater core hoses a few years back with the rubber non braided type. I thought that was it for another 10 years or so but i got a big surprise when i heard a hissing noise
    and then tons of steam inside the car.

    This night really sucked. It took me 2 hours to travel 30 miles. It completely drained my radiator and i only had a lunch box with a dr pepper and 2 ice packs. You can't imagine how expensive a tow is at midnight in hawaii. So i improvised. First the dr pepper went in then i poked holes in the ice packs. Its semi liquid but helped a little. 2 mph in the emergency lane and i finally reached a little shopping center and drained some stinky koi pond water.

    Anyways, fortunately i live in a place that is warm enough to not need a heater so i just bypassed the heater core altogether. I was reading a few threads in the past about looping to bypass the heater
    and how bad it was for the coolant temps in the cylinders in the back of the head. So i plugged everything off.

    The lesson learned here was to replace the heater core hoses with
    the braided type that last 30+ years.

    Click image for larger version. 

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  2. #2
    Registered User EuroDat's Avatar
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    Feb 2012
    The Netherlands


    I think mine are OEM, but not certain of that. They are braided though. I know the Nissan dealer here has to source them from the states. At least the hoses are easy to replace or temporally block off.
    Heaters can be a problem. They are easily neglected because they are hard to get to. Different story when replacing the heater valve which worries me some.
    5/77 280Z HLS30 403100 with some modifications
    Original colour: 305 Light Blue. The PO changed it to Red

  3. #3
    Registered User JGREEZY's Avatar
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    Jan 2012
    Ronkonkoma, New York, United States


    I had this exact problem happen to me Sun. morning at a show I don't think I did it correctly. I cut the hose going into the firewall and connected it to the rear of the cylinder head. now that I look at what you did. I think I'm going to plug the holes like you did. on my way home it stayed pretty hot. I hope I didn't do any damage

  4. #4
    Registered User siteunseen's Avatar
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    Jul 2011


    I'm going through the same thing. My heater valve is leaking onto the passenger's floor board so I looped the 2 connections with a short piece of hose instead of plugging them. It does run hotter on the gauge but feeling around the engine I don't think it's too hot for any damage. My local Nissan parts guy ordered one yesterday and I hope to get it today. I've found some Gates pre formed heater hoses that I can work into that tight spot next to the tunnel. I won't be shooting fire crackers this weekend, eating and drinking too much for sure though. I'll put some pictures and part numbers up when I'm done.
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

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