I have a 1989 190E 2.6 My Aux Fans don't come on in the low speed mode. Naturally my A/C compressor will kick off as the high side pressure gets too high. The fans come on in the high speed mode so I know the fans are OK. I bridged the high pressure switch on the receiver dryer and they still don't come on. So the pressure switch isn't the problem. I checked the fuses in the fuse box and they are all OK. The ceramic fuse has continuity. My meter shows about 4000 ohms. I tried jumping the ceramic resistor anyway and still no fans. Looking at the wiring diagram I see there is a relay for the low speed fan. Does anyone know where this is physically located? Could there be another problem outside of a broken wire?

Thanks
Pete