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The condenser fan mounts on the passenger side in front of the condenser. I installed a condenser fan out of a series 4 in mine. It bolted straight in.
The relay is located in the relay box beside the battery. The switching side of the relay was already there. So the condenser fan is still ECU controlled. You just need to run a power supply to the relay and wire harness from the relay to the condenser fan.
The A/C will be more efficient with the condenser fan fitted.
I can post a photo of the condenser fan mounted if you need it.