Some of the service information for the 2016 CTS-V, ATS-V and Camaro refer to a fan controller but the controller is integral to the fan itself so the ECM is sending the control signal directly to the fan. No separate/serviceable controller exists as the DC brushless (BLDC) controller is built into the fan.
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					Originally Posted by andrewb70  Can you post a picture of the fan itself? Is this a 800 watt fan? Presumably a 2016 CTSV uses a PWM controller for that fan...
 Andrew
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