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Thread: Replacing heater hoses

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    Default Replacing heater hoses

    I am about to replace my heater hoses on my 240z. My question is; is there a simplier way to do this job. I can just barely get my hands in there to reach one of the hoses. I'm afraid that after I finally get them off, (inside the cabin),...I may never get the new one's installed and the clamps tightened.

    I would like to hear how some of you guys handled this job.
    Last edited by dltalfa; 05-13-2012 at 04:34 PM. Reason: Spelling errors

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    Registered User cbuczesk's Avatar
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    I replaced mine a couple years ago and I remember that it wasn't easy but it wasn't that hard either. I either used my tiny Craftsman ratchet with screwdriver atachments. Or I went with more modern hose clamps and a nutdriver and small ratchet. Remove your carpet so it doesn't get wet from coolant. You might want to remove the seat and crawl inside. Good luck!

    Chuck
    East Coast Z Nationals held at the Carlisle Import & Kit Nationals - May 16-18, 2014 Carlisle, PA
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    1969 240Z #390
    1971 Fairlady Z
    1971 240Z parts car
    1972 240Z ITS race car
    1972 240Z turbo
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    1975 280Z my first car
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    Walmart greeter Mikes Z car's Avatar
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    When I replaced the heater hoses on my first 240 I made the mistake of twisting too hard on one of the hoses to get it off the heater core and the pipe that was a part of the heater core broke off. It might have done me a favor though, maybe if the heater core was that weak it needed replacing anyway.

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    Registered User Pat Carr's Avatar
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    I disconnected the heater control cable from the valve, removed the more accessible hose from the valve, disconnected both hoses from the engine, and removed the valve and second hose together. This way I was able to easily remove the second hose from the valve out of the car. I cleaned the valve and replaced the second hose, then reversed the process. There was no way I was getting that second hose clamp loose in that small space (I have the dealer installed AC).
    Pat
    73' 240Z

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    Registered User LeonV's Avatar
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    I removed the blower fan when I did mine, made them much more accessible. Still had to lay on my back and twist around a bit. Helps to put a towel down on the rocker...
    2/74 260Z

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    great info thanks all! have a bit of leakage on the passenger side I noticed today....

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    Registered User cbuczesk's Avatar
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    Quote Originally Posted by bounce View Post
    great info thanks all! have a bit of leakage on the passenger side I noticed today....
    I hate to say it but...if it were my car I'd pull the heater box out, clean it, install new seals, replace the heater core, etc.

    Chuck
    East Coast Z Nationals held at the Carlisle Import & Kit Nationals - May 16-18, 2014 Carlisle, PA
    www.carlisleevents.com/events/import
    1969 240Z #390
    1971 Fairlady Z
    1971 240Z parts car
    1972 240Z ITS race car
    1972 240Z turbo
    1974 260Z turbo
    1975 280Z my first car
    1978 620 King Cab

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    Replace the heater core??? Where do you find one? I looked everywhere I could think of about six months ago - no one had any at that point. Motorsports shows one - for like $300.00 - but did not have any to actually sell.

    FWIW,
    Carl B.

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    Registered User cbuczesk's Avatar
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    Quote Originally Posted by Carl Beck View Post
    Replace the heater core??? Where do you find one? I looked everywhere I could think of about six months ago - no one had any at that point. Motorsports shows one - for like $300.00 - but did not have any to actually sell.
    Ahhhh!!! You're right. They still sell them for the 280Z and that's what I was looking at recently. I suppose a radiator shop might be able to replace the center section and reuse the original end tanks. Thanks for pointing that out.

    Chuck
    East Coast Z Nationals held at the Carlisle Import & Kit Nationals - May 16-18, 2014 Carlisle, PA
    www.carlisleevents.com/events/import
    1969 240Z #390
    1971 Fairlady Z
    1971 240Z parts car
    1972 240Z ITS race car
    1972 240Z turbo
    1974 260Z turbo
    1975 280Z my first car
    1978 620 King Cab

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    Jim Arnett jfa.series1's Avatar
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    Agreed - pull the heater core and have it checked at a radiator shop. You stand a decent chance it can be repaired, if not re-cored. Also, replace the water valve with a new one while you are in there - cheap insurance against more leaks.

    Jim

    Jim Arnett
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    Registered User AWAUDIO's Avatar
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    Just another thought, remember to replace the small hose (about 2" long as I recall) that attaches to the heater core. I think they refer to it as a transfer hose (MSA catalog). It's also easier to do if you loosen the blower motor or remove it if you can. The front bolt on the blower is up against the rear of the glove box, so good luck with that (w/o removing glove box). Patience and a fair amount of contortion will get you thru it. I'd also replace the firewall grommets and go to standard hose clamps. Easier to deal with in tight spaces. Good luck. AW
    1972 240Z
    1977 CJ5
    1948 Plymouth

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    Jim Arnett jfa.series1's Avatar
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    FYI... this is what eveything looks like under the dash. I find it always helps me to have a picture in my head of what I am dealing with. You can see the short curved hose mentioned above. If I recall correctly, MSA sells the genuine Nissan part (pre-bent). Hope this helps.

    Jim
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Jim Arnett
    HLS30-15320 12/1970, original owner
    L24-020208 (original)
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    Registered User bobc's Avatar
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    Carl, if you need a heater core, let me know. I think I may have one.

    Bob

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    Default Heater core

    Quote Originally Posted by Carl Beck View Post
    Replace the heater core??? Where do you find one? I looked everywhere I could think of about six months ago - no one had any at that point. Motorsports shows one - for like $300.00 - but did not have any to actually sell.

    FWIW,
    Carl B.
    http://www.marketworks.com/storefron...6539657&page=2

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    Quote Originally Posted by Willoughby Z View Post
    THANK-YOU, THANK-YOU, THANK-YOU Kris!! How you found that I do not know. According to the salesman there it is actually their web site mostly for company use - they don't promote it in their advertising!! Anyway I have two on the way!! At $109.00 they are very reasonably priced as well...

    Glad I delayed putting the heater back together this week :-)

    FWIW,
    Carl B.

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    THANKS GUYS!!! I ended up removing the easiest hose, (which wasn't all that easy),..and then I removed the control valve as suggested and pulled the other hose out thorugh the interior cabin,..then removed it from the valve.

    It took me much longer than I had expected,..but I now have all new braided hoses on my car. It was worth it once I saw the finished product.

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    Jim, is it just me, or are your heater hoses going throught the firewall grommets reversed? They both end up at the correct hookups, but, on my car, the inlet hose goes through the bottom firewall grommet and the outlet hose goes through the top grommet.

    Dan

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    Default Replacing heater hoses

    Hello.
    You can remove the hose and carefully scrape the fittings clean, then apply a small amount of gasket sealer to the fittings to assure a tight seal with your new hose. Apply sealer to the fitting only this will help avoid any excess from possibly clogging the hose or a water channel in the block. Thanks..
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