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x5 blower works - no air through vents
I have a 2002 3.0 X5. When we first start the car, the hvac unit works great(air blows through the vents you want, any speed you want), then after we have run the interstate for over 1 hour, we notice the air starting to slow down out of the vents. Even when we press the max button, we hear the fan blowing as fast as it can, however it will not come out of any locations. The buttons show the change in directions, we can hear the fan running, but no outlet for the air. We have replaced 3 different resistors but nothing corrects this. We can then let it cool down for 30 min or more and it works fine for about 15 min and then starts to close the doors to the vents. Any Ideas?
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