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I have a 2010 Civic Si Coupe. The AC blows cold. The issue is that after about 5 minutes the airflow coming from the vents becomes extremely weak but still very cold. Before that it blows just fine. Regardless of temp or fan setting it still does this. It doesnt seem do it at idle though.

Where it becomes odd is that when the vents are blowing weak the fan is still blowing the same as when it was fine. If i leave the fan settings and temp where they are and just turn off the AC button to blow the airflow returns to normal in the vents without any change from the fan. It does with the recirculation on and off.

I have already replaced the HVAC module, vent door module, blower fan, and blower resistor.

Any ideas why its doing this?
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