What is the impact of excessive running noise of the cooling fan
Excessive noise generated during the operation of the electronic cooling fan is caused by the aging of the component function or the poor dynamic balance of the fan blade. It is decided to replace the electronic cooling fan. Trouble: According to the driver, during the cooling period of the active air-conditioning electronic control system, sitting in the driving room can hear the 'whee' noise announced by the electronic cooling fan when it is working. The sound is loud and it makes people feel annoyed. Fault diagnosis and removal: The electronic cooling fan of the car is a stepless speed regulation cooling fan.
The first step is to confirm the symptoms of the problem, start the engine, press the AC button on the active air conditioning control panel, the air conditioning compressor works, and the air blown from each outlet of the instrument panel is cool, indicating that the air conditioning compressor is working normally. The electronic cooling fan in front of the condenser starts to work. As the speed of the electronic cooling fan increases, the noise gradually increases, and it can be clearly heard even when sitting in the driving room. The maintenance experience shows that the new electronic cooling fan is installed and tested. After the engine has been running for 10 minutes, the new electronic cooling fan announces the noise again, and there is no improvement in the symptoms of the problem. Connect the GTl tester for self-diagnosis, select the 7 series E38 chassis model, double-click the 'IHKA Active Constant Temperature Air Conditioning' item in the main menu of the electronic control system diagnosis, and the GTl tester will quickly scan the item, and click 'Control' after completion. Module function' button, select IHKA electronic control system, query fault information, no fault code storage.
To test the function of the new electronic cooling fan, the method is as follows: close the incineration switch, turn on the incineration switch, and select the 'electronic cooling fan' test item in the 'Component Control' function menu of the GTl310 detector, and click 'Activate' Key, the new electronic cooling fan begins to gradually change from low-speed operation to high-speed operation. Stop after 30s. After repeated tests, it was concluded that the new electronic cooling fan function was outstanding, because during the whole test, there was no operating noise like the previous one. Exit the 'component control' function menu, restart the engine, select the 'diagnostic response' function menu, and check the new electronic cooling fan operation data. Click the 'Display' button, and the GTl tester displays the new operating data of the electronic cooling fan.
