Ziinsig Posted February 19 Share Posted February 19 Today, I observed that the radiator fans on my E270 are running continuously after starting the vehicle. This occurs when the air conditioning and the heating systems are turned off. The engine temperature and coolant level are within normal range. I have conducted a scan for fault codes and found no issues. Do you have any recommendations? Could the fan temperature sender be defective? Thank you. Link to comment Share on other sites More sharing options...
Tactical Posted February 19 Share Posted February 19 This occurs when the fan control unit loses its CAN-bus connection with the engine or AC controller. To safeguard the engine, the radiator fan(s) operate at maximum speed. However, this circumstance often leads to error codes. Inspect cables and connectors for faulty connections, corrosion, or misaligned contact components in the plugs or sockets. Link to comment Share on other sites More sharing options...
Notef Posted February 19 Share Posted February 19 A delayed fan activation upon engine start may indicate low air conditioning pressure or a malfunctioning air conditioning pressure sensor. Do you possess iCarsoft? Can you measure the air conditioning system pressure with the vehicle both off and running, and what are the corresponding values? Link to comment Share on other sites More sharing options...
Ziinsig Posted February 19 Author Share Posted February 19 Thank you for the recommendations. I do have iCarsoft. I will examine it. Meanwhile, I started the vehicle again and turned on the fans a few seconds later. Immediately, I saw the temperature gauge rise to 90 degrees Celsius. The temperature rose to 120 degrees Celsius and then decreased to 90 degrees Celsius. Is it likely the temperature sensor? What are your opinions? Link to comment Share on other sites More sharing options...
MaxiBroadway Posted February 19 Share Posted February 19 It definitely seems like a suspect. You should be able to see the precise temperature sensor data on the iCarsoft device. Norm is a Pulse Width Modulation (PWM) signal used for a fan, with a diagnostic signal grounded to enable the fan controller to communicate faults to the Engine Control Unit (ECU). LIN may be affordable and sufficiently quick, however CAN would turn the controller into a costly option. Link to comment Share on other sites More sharing options...
Ziinsig Posted February 19 Author Share Posted February 19 The coolant temperature sensor is located in the thermostat housing. I still have the original thermostat housing that I changed 5 years ago, and I plan to transfer the sensor over when I get the opportunity. Link to comment Share on other sites More sharing options...
Ziinsig Posted February 19 Author Share Posted February 19 What is the definition of LIN? Link to comment Share on other sites More sharing options...
MaxiBroadway Posted February 19 Share Posted February 19 The Local Interconnect Network (LIN) is a 12V serial communication system where one master device (such as an ECU) controls one or more slaves (such as a glow controller and alternator). Slaves only transmit data when requested by the master. This is in contrast to the Controller Area Network (CAN) where every device can act as a master and send data without being prompted. Link to comment Share on other sites More sharing options...
Jollyno Posted February 19 Share Posted February 19 Inspect the fan relay for any stickiness. Link to comment Share on other sites More sharing options...
Ziinsig Posted February 19 Author Share Posted February 19 I believe the temperature measurements should not be affected, which is why I am focusing on the temperature sensor. Link to comment Share on other sites More sharing options...
Ziinsig Posted February 19 Author Share Posted February 19 This evening, when I inserted the key and turned on the ignition without starting the engine, the temperature readout quickly rose to 90 degrees Celsius. The first difficulty indicates a problem with the temperature sensor, causing incorrect fuel settings due to the engine being cold while the computer believes it is at operating temperature. I will test the other sensor on Sunday. Conducted an air conditioning pressure scan as recommended before, and it shows a reading of 3 bar. Link to comment Share on other sites More sharing options...
Ziinsig Posted February 19 Author Share Posted February 19 I tested the alternative sensor by just plugging it in while it was hanging freely in the air, still within its housing. The temperature was normal and the fans did not turn on, confirming its functionality. I attempted to extract the functional sensor from the previous casing, but it is firmly stuck and resistant to removal. Given the difficulty, I anticipate encountering the same issue with the sensor in the vehicle. There is a possibility of damaging the sensor socket, thus it is necessary to replace the whole housing with a new one. Link to comment Share on other sites More sharing options...
Ziinsig Posted February 19 Author Share Posted February 19 There is an issue with a parts supplier. I prefer Topran products because they are often original equipment manufacturer (OEM). I have experienced a situation with Autodoc where they substituted a part from a manufacturer named Stark without my consent. Research indicates that Stark is a Chinese manufacturer owned by Autodoc, and I am not the only one who has encountered this issue. Main dealers are now out of stock with extended wait times, making it uncertain when they will have the product available. Link to comment Share on other sites More sharing options...
MaxiBroadway Posted February 19 Share Posted February 19 I swapped out the faulty component on my E220 with a Mahle replacement part. You should be able to quickly find one of them. Link to comment Share on other sites More sharing options...
Ziinsig Posted February 19 Author Share Posted February 19 Euros do not display a specific brand, whereas GSF exclusively offers quality products. I purchased a Calorstat from them last time, which are generally reliable, although I was unaware of the brand until I received it. Link to comment Share on other sites More sharing options...
MaxiBroadway Posted February 19 Share Posted February 19 The item was purchased from Partsinmotion, more precisely from their eBay shop named partsinmotion. It seems that the item is no longer available for purchase, however there are other similar items with the same component. The items are listed by Mahle part number, thus they will not appear in search results if you search for E270. Uncertain whether this matches yours. Link to comment Share on other sites More sharing options...
MaxiBroadway Posted February 19 Share Posted February 19 https://www.ebay.co.uk/itm/313000908756?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=oKZ3Yp7_TDK&sssrc=4429486&ssuid=1kh8SLZbTGS&var=&widget_ver=artemis&media=COPY&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338181125&toolid=10001&customid=2518X1570512X096ab36e181c1b70c8fd77036bc80cdc Link to comment Share on other sites More sharing options...
Ziinsig Posted February 19 Author Share Posted February 19 I successfully replaced just the temperature sensor in a recent upgrade. In the original Mercedes model, I was unable to remove the sensor. However, I saw that the sensor in the Calorstat could rotate. I successfully removed it and replaced the sensor, achieving the desired outcome. Subsequently, everything has returned to normal, with fans and temperature operating correctly. Link to comment Share on other sites More sharing options...
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