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Do you know if the new radiator has the same number of 'Fins per inch' as the factory original? I replaced a factory radiator in a Merc G Wagen with an aftermarket unit and they reduced the FPI. The result was inadequate cooling and the vehicle radiator got so hot it actually radiated the heat into the a/c condenser and would lock up the compressor with the higher pressures - was a bloody expensive fix, but a simple cause. Might pay to see if this can be checked?