2009. 11. 9. - . Forums > W124 E,CE,D,TD Class > auxiliary cooling fans not running . The auxiliary fans aren't working, and my mechanic noted 'jammed . 2003. 6. 25. - E-Class (W124) - Any Idea? My Auxiliary fan is not working! . My auxiliary fans just stop working, (no matter idling till 100C, A/C on and off ¡V . AC felt cool at idle but the auxiliary fan didn't kick on. I put 12V to the connector and the fan does work. So if the fan is supposed to kick on when . I noticed my Aux fans no longer come on. The fuse is not blown. The red switch on the receiver drier is working. When I short the red switch . My N-plate E220 coupe has a viscous fan and an auxiliary fan attached to the A/C. . It is only working when the A/C is on. Is the aux fan . 2011. 8. 20. - I think the aux fan is controlled via a thrmo switch as well as the AC relay . Used to think ours did not work as rarely came on in the uk but in the . The two auxiliary fans that help keep your car at a proper operating temperature are . Loosen the condenser from its mounts but not open the system. Figure 2. So in summary, your issue is that one of your fans isn't working and needs to be replaced. Also, the low 1986-89 Aux fan schematic w124.