Ask Again For Your Help…Beautiful Smell From the direction of KÜhler / Motorraum Vorn

I’m sorry!!! It’s not really about my OMEGA B 2,5 TD automatic. For a few days now, a bad smell or better said stench from the engine compartment into the car interior. After a long search I’ve turned out the front engine compartment, so the area front of the engine as a source of smell. When the engine hood is closed, the smell rises up from the grill. If the cooler KALT, the smell is very intense and to break. It smells like a burnt cooled coupling. Are engine and cooler WARM the smell is weaker and smells like burnt plastic or rubber. If the engine hood is opened, the hot air of the engine comes to it and the smell is not falsified and weaker about? I’ve only checked the temperature / smell is definitv different and level unchanged 2. Servo oil and brake fluid / odour differently and filling levels unchanged 3. Climate jumps and Compressor runs properly / climate is not very cold / too easily in the garage water?