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The factory ECU is set to turn on both the 1st and 2nd fans at 207F. The temps can fluctuate between 180 and 207 under normal driving conditions. If the temps stay above 207F for an extended period of time, under normal driving conditions, it may be indicative of a problem. Under very hard driving (track day) it isnt abnormal to see temps up to 215F. Anything above that and you should let the motor cool down. It is important to use Subaru OEM coolant, and be sure to include a bottle of the Subaru OEM coolant conditioner. Finally, ALWAYS use the OEM radiator caps for both the upper and lower positions. Aftermarket caps can cause pressure issues with can lead to overheating and possibly a head gasket failure. My source: I have been through all of this first hand. Hope this information is helpful!

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