corrosion in Scania aluminum radiator with N-OAT coolant

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Feb 15, 2019
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7
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LIMA
Hi, the coolant used by this new Scania radiator with 50K miles, is an N-OAT coolant. The fluid recommended is an hybrid Si-OAT. Ok, this was not the fluid in this radiator, however this is not the reason, why the radiator can present this type of corrosion?. Glycol is at45% and contains the sodium in 12 ppms, pH is 8. Ca and Mg traces. Why this radiator can be with type of corrosion? Please your explanations.

This radiator is for a bus with diesel engine Euro 3.

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You’re showing the exterior of the radiator, correct?

How do we know what you’re looking at is coolant-associated corrosion?

Is the radiator leaking out or something? Could this be foreign dirt/debris thst is corroding because of the dissimilar materials?
 
You’re showing the exterior of the radiator, correct?

How do we know what you’re looking at is coolant-associated corrosion?

Is the radiator leaking out or something? Could this be foreign dirt/debris thst is corroding because of the dissimilar materials?
Yes radiators corrode on the exterior for many reasons, none of which are related to the coolant.
 
You’re showing the exterior of the radiator, correct?

How do we know what you’re looking at is coolant-associated corrosion?

Is the radiator leaking out or something? Could this be foreign dirt/debris thst is corroding because of the dissimilar materials?
Yes, is the exterior. This corrosion associated at the coolant was done by the mechanics. Not leaking. Appears corroded externally, we will check this, thanks for for your help.
 
I'm intrigued by the fact you're working on a Scania. Guessing you are across the pond somewhere. Always wanted to see one of those trucks.
 
Electrolysis is easy to check for. Get a digital voltmeter and clip one lead to a metal part of the radiator and stick the other probe in the coolant. Electrolysis will show up as voltage. I've seen as high as .5v on some vehicles. Try it a second time with one lead on the engine itself and the other in the coolant. Our coolant was going alkaline which would attack the solder joints. Another issue could be someone using an inappropriate chemical to clean the fins. Good luck and let us know what you find.
 
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