Check rear axle for leaks. Once the 160-degree F threshold is achieved, the recorded car engine temp has to … Faulty Temperature Sensor: It’s possible that the temperature sensor on the engine block is faulty, and sending inaccurate information to the car’s computer/dash gauge. 2013 Mercedes Benz ML350 Coolant Temperature Sensor. Normally it runs just above 80C. Most cars run somewhere between 180-200F (82-93C). Fins built into the radiator help disperse the heat as air passes over them. display a reading of 389 degrees. So - in hot weather your car running around 100C with the A/C on is not abnormal. The best part is, our Mercedes-Benz ML350 Ambient Air Temperature Sensor products start from as little as $31.99. It's perfectly normal. In order to get an accurate reading, your 3.5 liter engine should be cool to the touch when you check it. The auxiliary fans in the M119 engine come on at 107C and 115C (I believe). Brand New Coolant Temperature Sensor Suits Mercedes Benz ML320 ML350 W163 1 x Coolant Temperature Sensor Fits Mercedes Benz ML320 ML350 W163. It could also be something as simple as sitting in bumper-to-bumper traffic on a hot summer day. Strongly recommend his service. Mercedes-Benz ML350 - Brake Pads Replacement (Front, Rear) - Las Vegas, Nevada. Deteriorating Hose: Your radiator hoses are responsible for transporting coolant to and from the radiator. The radiator cooling fan is the main fan and runs mostly at idle and low speed to maintain normal operating temperature, and whenever the A/C is turned on. In this instance, the reading is incorrect and your car’s engine temperature is most likely normal. Coolant Temperature Sensor. When it fails in open position your Mercedes-Benz engine will take a long time to reach the normal operation temperature. I highly recommend. If the temperature is about 0 def. The coolant flows through the engine, and then back into the radiator. Safe would be around 190F, 90 C. Commonly a water cooled engine may run at 220F, 105C maybe even 230F, 110C in the summer with the AC on without significant problems. If I'm not mistaken, this is normal. The normal engine operating temperature, for a 3306 Caterpillar diesel engine, is 180 degrees. 1-3 of 3 Results. Your coolant system is designed to help remove heat from the engine during operation. Fast and easy service at your home or office, Backed by 12-month, 12.000-mile guarantee. Also you can check the resistance of the sensor to ground using an Ohm meter. What is the optimal engine temperature for this paricular model? The mechanic will then provide a detailed inspection report that includes the scope and cost of the necessary repairs. JOHN J66 MEMBER; 2010 MERCEDES BENZ ML350; 6 CYL; AWD; AUTOMATIC; 108,000 MILES; Hello, I was trying to find the location of the sensor due to the fact I had the engine light come on. RepairPal will help you figure out whether it's your Coolant leak (water pump, radiator, hose etc. Checking the engine coolant (also known as antifreeze) level in your 2013 Mercedes-Benz ML350 is pretty easy. This sensor has a major influence over fuel mixture when the engine is cold. They’re designed to increase the boiling point of coolant by pressurizing the system. I have actually spoken to my dealer's workshop people who made similar comments and everyone seems to agree that the 112 engine runs at bit above 80c and then goes up to about 85c+ if sitting in traffic/ restricted air flow. A Mercedes Benz Ml350 Engine Coolant Temperature Sensor Replacement costs between $345 and $429 on average. Several potential problems could cause your car to start running hotter than normal without overheating.