OmahaKnot Posted August 26 Share Posted August 26 Greetings, I own a 2007 R56 Clubman Cooper S. The issue lies in the fact that the radiator fan is not functioning. Although this difficulty has been experienced by many individuals, I kindly request that you continue reading. Installed a replacement radiator fan. The issue persists with the fan not operating at either low or high speeds. Verified the functionality of both relays and confirmed that they are in proper working condition. Nevertheless, the control circuit for both the low and high-speed fans only registers a voltage of 11.2V. The fans are powered by a main voltage of 14.6 volts. I improvised a configuration of cables to enable me to do tests on the relays. There seems to be no negative effect, since the fan turns on when I connect a hot wire to the negative terminal of the battery. When I start the automobile from a chilly state and activate the air conditioning, the low-speed fan fails to engage. In addition, I have inspected all the fuses and confirmed that they are functioning properly. I removed the fuse/relay chamber located in the engine bay. I thoroughly inspected and cleaned it, but I could not identify any flaws or issues. Eliminated the obstructed ECU and thoroughly cleansed it using electrical cleaner. There is no progress or activity. I own two R53's and have successfully reconstructed both, indicating my proficiency in automotive mechanics. I am open to any recommendations. Link to comment Share on other sites More sharing options...
Cincoon Posted August 26 Share Posted August 26 If the engine is running and you disconnect the temperature sensor plug in the thermostat housing, the fan should turn on. This indicates that the coolant circuit for the fan is functioning correctly, but there may be a fault in the air conditioning circuit. If there is a fault code stored for the air conditioning system, the fan will not run. Additionally, if there is no gas or insufficient gas in the system, the fan will not operate. The switching circuit from the DME (Digital Motor Electronic Link to comment Share on other sites More sharing options...
OmahaKnot Posted August 26 Author Share Posted August 26 Thank you for your prompt reply. I have thoroughly verified the polarities prior to hot wiring, just for that purpose. The air conditioning unit is filled with refrigerant. However, there are still a few codes remaining. If I allow the engine to reach a temperature between 105 and 112 degrees Celsius, the cooling fans do not activate. Subsequently, I pass them across a heated wire via the relay in order to lower the temperature of the engine. I will test the thermostat tomorrow morning and inform you of the results. Thank you. Link to comment Share on other sites More sharing options...
Cincoon Posted August 26 Share Posted August 26 The fan typically activates at a temperature of 110 degrees Celsius. I own a diagnostic instrument that enables me to manually activate the fan in order to verify the functionality of the circuit. Link to comment Share on other sites More sharing options...
OmahaKnot Posted August 26 Author Share Posted August 26 Thank you, I will inform you tomorrow. Link to comment Share on other sites More sharing options...
OmahaKnot Posted August 26 Author Share Posted August 26 I followed your instructions and the fan began operating. I am seeing the appearance of the following error codes on my AC unit: Carly E71E, E71F, and E734. I have already replaced the temperature control panel located in the central console. I would appreciate your insights. Link to comment Share on other sites More sharing options...
OmahaKnot Posted August 26 Author Share Posted August 26 Could the AUC sensor be defective? Link to comment Share on other sites More sharing options...
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