Holts radweld

Discussion in 'Tech/Mech General' started by dethleff, May 16, 2008.

  1. dethleff

    dethleff Read Only Funster

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    Hi

    I have slight leak, that my Mechanic says is coming from the heater matrix.
    He has suggested that I try Holts Radweld.
    Has anybody tried this?

    Stan
     
  2. Geo

    Geo Trader - Funster

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    Yes I make a living out of changing radiators and heater matrix's blocked up by the stuff:Doh:
    if the cooling system is corrosion free IE nice and clean give it a shot, it will only block small holes, however heater matrixes don't normally suffer core damage as the're not exposed like a rad is, its more likely to be a crack in the housing or pipe ends and these will shrink and expaaaaaaaand with temp changes and keep opening the wound so to speak
    If your coolant is rust coloured don't use it at all, as the cores in both rad and heater will be partialy blocked with rust already and the rad weld will finish both off
    Geo
     
  3. Digger Driver

    Digger Driver Read Only Funster

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    Its rubbish!
    Find your local radiator specialist!
    There really quite cheap!
     
  4. Diabalo

    Diabalo Funster

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    I Have to go with Geo on this, as an ex welder I used to mend em from time to time and have seen the effects of it being used first hand. IMHO radweld or the likes should only be used in an emergency. It can block any restictions in the waterways which could lead to the engine overheating.
     
  5. pudseykeith

    pudseykeith Read Only Funster

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    Hi Stan
    A far kinder product is 'Bars Leak'. It contains a soluable oil. If you are stuck at the side of the road they are life savers, but not ment to be permanant.
    Having said that years ago the company where i worked had a works ambulance [ Morris with a side valve engine] with the block cracked the full length of the water jacket. We put 2 bars leaks in and it closed up the crack like magic and never leaked again over the 4 years i worked there, and withheld a strong mixture of bluecol anti freeze. I have never known one to cause an overheating problem. I always carry one for just in case.
    Pudseykeith. :thumb:
     
    Last edited: May 16, 2008
  6. dethleff

    dethleff Read Only Funster

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    Really?

    below is a post from a web search.

    I have read a posting on here regarding a similar problem to my own. Last year I had a drip inside the cab from the heater matrix spilling antifreeze on the cab floor. No sooner had it started but in a week it had stopped and never to be seen again... until last week when it poured out relentlessly and continues to do so. The local fiat dealer says its a dashboard out job taking 2 days plus parts and it will cost up to £2000. I have now found a local garage who will put in a new heater matrix and do the job in a day, well under the fiat dealers costings. We thought it would be possible to exclude the heater system from the vehicle and bypass the affected leak but no one has been able to do this so the big job must be done. Is this common to the ducato as we're thinking of buying another new one but at 2yrs old this is a costly out of warranty repair. However the vehicle has covered over 97k miles and is faultless apart from an idler gear type rattle, so may be tempted to have another.
    __________________
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    Can I ask what your advice was based on?

    Stan
     
  7. American Dream

    American Dream Read Only Funster

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    I have used Rad flush before to clean the cooling system prior to diagnosis.

    This only stays in the cooling system for a short time before flushing out.

    I never use Radweld or similar because it can cause more problems/make existing problems worse.

    Get to the root of the problem and replace parts if necessary.:thumb:

    I've had radiator/heater matrix's re-cored before now at a reasonable rate.

    Rebuilt the special one on the Lotus myself.
     
    Last edited: May 17, 2008
  8. pudseykeith

    pudseykeith Read Only Funster

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    Hi dethleff.
    Heaters take water from the engine block and return it back to the block after going through the heater. Both water conections nead to be pluged. Find the 2 hoses that run from the block and into the heater unit or go through the bulk head and ito the cab area. cannot see why this should be a problem. Try bars leak !!
    Pudseykeith
     
    Last edited: May 17, 2008
  9. American Dream

    American Dream Read Only Funster

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    Either that or loop a hose between the two.

    It's going to be B++++y cold in the cooler months.

    Personally I'd get the Matrix Rebuilt. unipart
    [​IMG]

    Just a thought. The warm air is also useful for keeping the Windscreen mist free on damp soggy days.You might have problems without it.
     
    Last edited: May 17, 2008

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