Renault Df1070 |link| Here

On pre-2012 Euro 5 versions, the Exhaust Gas Recirculation (EGR) cooler was prone to clogging and cracking. When it cracks, coolant leaks into the intake manifold or exhaust. Symptom: White smoke on startup and a mysteriously dropping coolant level with no external leak.

Use a manifold gauge to verify if there is actually refrigerant in the system. renault df1070