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Leak from Heater Box

Discussion in 'Defender 90 / 110 / 130' started by border, Aug 8, 2020.

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  1. border

    border Well-Known Member

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    Bet yous thought youd heard the last of me for a bit and were going to get a rest from solving my problems :D.
    Well just had MOT yesterday and found my first problem today.
    After giving its first few short runs down the dual Carriageway a few times I noticed it was loosing water, took ages to find leak but it is coming from the back of heater box, so take it that its the Matrix thingy.
    Been looking at other posts, and think I need to get it out to take a look, now what's the easiest way to do this, anyone any Ideas. Although its not a bad leak it is getting worse.
     
  2. Flossie

    Flossie Well-Known Member

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    Bonnet off, drill out the rivits, bend back the flap.
     
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  3. border

    border Well-Known Member

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    Was hoping that was a way to do it rather then take the whole dam thing out.
    Mine has the pipes that curve down will I have to get the same as some others have them straight out ?
    Or is there a way to actually fix the leak ?
     
  4. tottot

    tottot Well-Known Member

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    When I changed mine went from curved pipes to straight no problem. It is just 4 bolts holding the box in but you do need a mate to hold a spanner on the other side of two of them. Sorted mine off the truck, this also gave a chance to give the foot well underneath some anti rust treatment. A new matrix will no doubt help with the heating.
     
  5. border

    border Well-Known Member

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    Thanks think I ll do it Flossie s way, save taking all the other bits out to get to it. just hope my local Land place has one in stock, there open tomorrow morning,
     
  6. Flossie

    Flossie Well-Known Member

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    You can link the 2 hoses together using 15mm copper plumbing fittings so you can keep motoring.
     
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  7. Hicap phill

    Hicap phill Well-Known Member

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    +1 on joining the hoses to keep it running while you fix it.
     
  8. border

    border Well-Known Member

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    Do you mean Something like an elbow bend, then just use the jubilee clips ??
     
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  9. flat

    flat Well-Known Member

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    Yep that’s exactly it. I used one of those corrugated plumbing pipes when I did mine
     
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  10. Hicap phill

    Hicap phill Well-Known Member

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    Yep.
    Or a bit of straight
     
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  11. border

    border Well-Known Member

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    Perfect thanks Men.
     
  12. Hicap phill

    Hicap phill Well-Known Member

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    Don’t forget a bit of camping/uva matting to hold things tight & seal up any gaps when rebuilding
     
  13. Birdbrain

    Birdbrain Well-Known Member

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    It’s easier to take heater out. Not a hard job but as others have said it maybe useful to have a second person. I changed matrix to a bigger Alisport one which requires a bit of modification to heater box. Take the opportunity to fit new gasket between heater box & bulkhead at same time - you’ll need one. Guaranteed! Also gives you opportunity to make sure all the various flaps etc are moving freely & clean out the debris from the fan.
     
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  14. border

    border Well-Known Member

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    My Landy shop Cant get Matrix till Thursday, probably get one quicker of Ebay.
    So if I join both hoses together as in above posts, will it be OK to drive as normal till then ?
    Thanks
     
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  15. Hicap phill

    Hicap phill Well-Known Member

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    Yes. Just make sure you the pipes don’t make an air lock.
    Connect & bleed the air.
    My S1 is linked & no heater been like it for years;)
     
  16. Flossie

    Flossie Well-Known Member

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    Yes. As birdbrain says (unless you're confident the heater flaps all move smoothly and you have no air from the fan escaping where it shouldn't) remove the box and give it a good clean inside and replace all foam seals while it's nice weather. Winter time is not great to find the heater is poorer than it should be.
    For the bypass, from memory, I used 2 elbows and 3 short pieces of 15mm tube to make a 'n' shape,
     
  17. border

    border Well-Known Member

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    Found this off an old Toyota, perfect for the job, no more leaks, waiting for matrix to come Thursday, was going to drill the rivets out ready but my bloody drills packed up :(, mind you its had some use during the rebuild.
     

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  18. border

    border Well-Known Member

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    Got the old one out, ready for New one in.
    first Pic shows flap open second closed, there was a thin layer of old foam, not much left of it now on the inside of this flap in first pic, not sure how Thick it was to replace. Also going to put some round the sides of new Matrix, but there is a large gap inside the box so will have to stick it on side of Matrix with something to hold in place, or would cable ties do wrapped round ?
     

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  19. Flossie

    Flossie Well-Known Member

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    Camping mat and impact adhesive.
    Glue it to the flap and wedge it shut for a day. Double up the mat for thicker gaps. The best mat is smooth and soft and warm to the touch, cheaper ones are more rigid and grainy looking. The nicer ones tend to be blue for some reason when I got some.
     
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  20. border

    border Well-Known Member

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    Thanks Ive got a couple of Gym Matts suppose near enough the same thing, will get a good look at them tomorrow. also got this stuff used for underlay for headlining about 10 mil thick,
     

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