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Old Today, 10:03 PM   #1
Commander Keen
Scooby Specialist
Member#: 319157
Join Date: May 2012
Chapter/Region: MAIC
2012 Impreza 4DR 5MT

Default Cooling Fan Mod

After the recent posts about poor A/C performance, I looked through the service manual and found something that might improve cooling.

The ECU runs the fans at four different speeds based on A/C load, coolant temperature and speed. This mod forces both fans to run at full speed whenever any cooling is requested by the ECU. This may help improve A/C performance at low speeds.

Simply bridge the Red and Red/Blue wires in this relay box as shown by the yellow wire (used for illustration purposes).

Warning: Do this at your own risk. I have not tested the long term effects of this mod. Carefully note the wire positions. These are ECU lines and getting them wrong could damage the ECU. There is a Blue/Red wire in this bundle and it's NOT the one you want.

This applies to 2012-2016 cars. This may be possible on 2017+ but I can't tell without a wiring diagram.
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