Cylinder Head Crack Found – Unexpected Diagnosis! • Coolant Leak Through Cylinder Head – Diagnosis and Root Cause • In today’s video, we’re working on a third-generation Renault Master with a 2.1-liter diesel engine, engine code M9T. The owner complained about a constantly dropping coolant level in the expansion tank, a noticeable smell of coolant both under the hood and sometimes in the cabin, and occasional puddles on the ground after parking. • 🔍 During the initial diagnosis, I removed the t