The engine was overheating and pushing coolant out of the radiator cap. A blocked DPF had previously been diagnosed at another workshop, however the customer was concerned the overheating was the underlying issue.

The vehicle had been previously diagnosed elsewhere as having a blocked DPF, with a replacement DPF already purchased by the customer prior to arrival. On arrival at the workshop, however, the engine was found to be overheating to 105 degrees Celsius and consuming coolant, pushing it out of the radiator cap. The cooling system was also building pressure rapidly from cold idle, reaching 0.8 bar within one minute, with a fault code coming pending that triggered limp mode.