Ok, so back in July our a.c. would only blow on high, which would lead us to a bad blower motor resistor. Fine, replaced, worked great for about a month, then when on high we noticed that it gradually would slow down, the air coming out the vents, as if some messed with the fan switch on the control panel inside the cabin but it was still set on high. If you leave the a/c power button on when shutting off the vehicle and then start it later, sometimes the air will blow high again and sometimes it will not blow at all. So, a month later, we replaced said motor resistor thinking maybe it went bad again. We replaced it...bam air on, blowing high and great, husband changes fan speed and bam nothing coming out of vents again. We wait a little bit, I turn the fan control to high again, start the van, air it comes back on...blows high again but as we are driving for about an hour, it slowly decreased in speed where barely any air is coming out of the vents and no one has touched the fan speed switch. We are at a loss. Could it be the control panel inside the car, the a/c switch? I don't "think" it's the actually blower motor bc it blows great when it is working. So any ideas would be helpful. Thank you.