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On the Viggen the car's computers measure ambient and post intercooler temperatures. Thus it seems that it would be possible to turn on the fan in a manner similar to the Autospeed controller. Too bad Saab didn't do this.
I agree bypassing the fan relay would be a good means to test this modification with zero investment.
As I said many of us noticed that in traffic leaving the air yields a very noticeable performance improvement.
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