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The Real Dangers - Mixing Radiator Inhibitors - Stray Voltages - |
| Aluminium Radiators and Engineering are certainly experts
in this area and accolades of praise go to them for bringing this
potentially dangerous and very expensive problem to everyone's notice.
This photos below from their very graphical website show various horror systems. This is what can happen to your cooling system if care is not taken and sometimes can even happen if you take EXCESSIVE care of your vehicle by getting it serviced by different companies. The moral of the story is never under any circumstances mix inhibitors - even different grades from the same manufacturer. A.R.E. don't actually service radiators - they are manufacturers and the radiators shown are from jobs given to them by their sister company Brisbane Radiator Service Pty Ltd. In all cases the unlucky owners have been hit with unnecessarily high costs and we don't know what the cost of fixing the actual motors ended up being. There is another hidden radiator destroyer maybe already at work in your vehicle. This is "stray current". The maximum allowed by radiator companies before knocking back warranty claims is a maximum of 0.05 volt. According to A.R.E. they have seen a new Barina completely fail in under 7 weeks! They point out that no inhibitor known to man can slow down or prevent the effects of stray current. Jammed thermostats is another potentially dangerous condition caused by a combination of stray current and mixed inhibitors. Now think folks - has the company servicing your vehicle EVER told you about this? Some of the vehicles pictured here have used the MANUFACTURERS BRANDED product since new, yet have still suffered a catastrophic failure. In our case we intend ALWAYS being present at major services where fluids are replaced and letting them know that we are aware of this problem. It could be good practice to only use one workshop. Yes, this can be difficult, but with a bit of planning you can do this except perhaps for Around Oz trips. The trick here would be to buy the coolant you expect to need from your service workshop. In Queensland for instance we are the first to have the "less sulphur" diesel. Engines using this need new smokeless fuel need much more protection from oils. You guessed it - the oil companies are lagging in this area! To combat this we take along a container to our service guy and he fills it from their bulk supply - we use this for top ups between services if needed. TIP: Lots of workshops use one grade for many types of vehicles (Pro-blends) - you really shouldn't use petrol engine oil in a diesel. It pays to ask, as oil is cheap - a new engine isn't! If in doubt ring the manufacturer direct and don't be fobbed off. We managed to get our dealer to email us the grade they were using by acting "dumb". You can get far more information than we have even hinted at here on the excellent website of Aluminium Radiators and Engineering. Sadly the site is in the dreaded frames, so we can't give you the exact bookmark to get into the "horror" section. Go in via their Enter button, and the ONLY way to get there is to scroll down inside the drop down menu to horrors. Many people could easily miss this vital page that truly shook the socks off us! Has anyone come across this in any of the mags? |
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VP Commodore Stray current & mixed inhibitors didn't give this aluminium core radiator much chance of a life. The current was 0.09 of a volt, so we are sure the mixed inhibitors did most of the damage in this case. The new assembly A.R.E. supplied to the mechanical workshop lasted 4 months, and no, they didn't have their warrantee claim allowed. They didn't check stray current levels (max. 0.05v allowed) and didn't flush the engine/heater assembly. properly. Core manufacturers are really strict on this now. |
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| Rarely seen nowadays - thank goodness. This is an unusual mix of inhibitors, where they must have both (or more) deposited very heavy coatings on the water jacket walls and when reacted, peeled off like a thick plastic coating. The radiator came to A.R.E. from a workshop so they didn't get to see inside the engine. Chances are though that it was a real shocker ! The radiator in this case had a copper/brass core. |
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1989 Toyota Landcruiser 60
series diesel A.R.E. can't remember seeing a worse core than this one. Oddly enough the vehicle was driveable, but only for 6 - 10 kms at a time. Lady owner for the last 11 years. Shifted cities 3 times and used to get the vehicle serviced at local service stations. This engine was a major problem to clean out, and the only solution was to strip and hot tank, with all new hoses, heater, etc. Apparently the head gasket was good and not supposed to be have contributed to the build up to this .copper/brass core radiator. |
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Datsun Stanza Believe it or knot A.R.E. managed to save this one. In the trade they call this "baby poo sludge reaction". This is mixed inhibitor in the very, very early stages of development. As soon as it thickens and reduces cooling efficiency sufficiently the motor will boil and a vicious circle of unstoppable events will occur. With high heat the goo will solidify and eventually totally block the radiator.
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Ford Telstar
Something not often seen in aluminium cores - fin corrosion. Fin corrosion and areas accelerated when tubes started weeping. When fins corrode the strength of the core decreases which speeds the break down of the fins. Water is literally pouring out of this doomed radiator.
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Last updated:
23-Jan-03