Originally Posted by SwiftDB4
3 possibilities Mike.
1. On your door HVAC controls is the airflow knob set fully to face vents?
2. Did you change the fan relays as recommended by Superformance? The latest cars may have this update already.
3. Some of the vent hoses behind the dash are crushed during installation. You can access them after removing the A/C evaporator in the front compartment. There is a lot of excess hose that can be shortened and the kinks opened up. That helped my car.
What changes has Superformance recommended to do regarding the fan relays?