Valeo says a common issue with the Vauxhall Vivaro 2.0dci, Nissan Primastar X83 2.0dci and Renault Traffic 2.0dci is the belief that the radiator fitted has failed resulting in the engine over heating. The radiators returned all affect the second generation vehicles made by the named manufacturers and all contain the Renault M9R engine. Analysis of the returned radiators show no fault with the units and further inspection of the vehicles concerned have revealed a common fault that causes the engine to overheat. The issue itself – and the reason why the engine overheats – is due to the failure of the fuel injector. The fuel injector has been found to be corroded and working intermittently. Valeo says the cause of the failure is down to water entering the engine compartment under the outside of the windscreen, around the scuttle panel area, and then accumulating on top of the engine. This has been found to occur when the weather seal that diverts water away from the engine bay area has not been correctly located or been replaced incorrectly (i.e. after the fitment of a replacement windscreen).