How wide does the air dam go? So long as it reaches out to at least as wide as the inner edges of the front tires, I think it would be good.
Is the bumper cover open on the bottom side, or can you see the radiator/condenser from just infront of the airdam? I'm wondering if you may have inadvertently made an airdam that is great for cooling purposes, creating higher pressure infront of the radiator / air dam, while causing lower pressure behind the radiator / air dam, causing more air to go through the radiator, not around the car. I would close / cover up the bottom side of the bumper cover (assuming it's open) to help make sure the air your blocking is going around, not through. That by itself could potentially reduce air flow through the cooling system to less than stock( I kinda doubt it though) but monitor how each step affects your coolant temps. If the air dam is creating a lower pressure behind the radiator, it would help draw more air through the radiator, so you could exploit that by blocking part of the grill opening
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