Mercedes Overheating, Poor starts & Mileage R129, W124, W201 Coolant Temperature Sensors, Thermostat

Video shows how to diagnose, test and understand your car's coolant temperature sensors and how your car is kept cool. These sensors (including the thermostat) help keep the engine cool, optimally regulate engine temperature for best performance and fuel economy, and help with cold and warm starts. Video also describes how car's achieve ideal engine operating temperature. Video applicable to most R129 SL, including the 500SL, 300SL, 320) most W124, most w201 and for many other 1980s and 1990s Mercedes-Benz, including those with KE-Jetronic. Four sensors are discussed in detail: 1. Thermostat (technically not a sensor, but functions on temperature) - coolant flow 2. Coolant temperature sensor (CTS) - ignition and fuel (B8/8 sensor in Benz language), 3. ECT sensor (auxiliary fans) - air conditioning and extreme overheating protection (B10/8), 4. Instrument Cluster engine temperature sensor. Location of parts shown in the video will vary by model and year of car, but they are there. Handy Val Aux Fan Video:    • Mercedes Aux Fans, Engine Cooling & Air Co...   Handy Val Coolant Reservoir Video:    • Mercedes Coolant Reservoir Change and Part...   Car Shown: 1992 Mercedes-Benz 300SL (M104.980) Mercedes Handy Val DIY Playlist:    • MERCEDES DIY Handy Val Playlist   Please see my Handy Val channel for my many Mercedes How-To videos on a number of different topics, and don't forget to like and subscribe as I post new videos regularly. Disclaimer - The content of this video is available for informational and educational purposes only. It is not intended to be a substitute for professional advice. I do my best to provide accurate and complete information, however, I assume no liability for any property or personal damage that may arise from any of the information contained in this video. Due to factors beyond the control of Handy Val, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Handy Val always recommends safe practices.