An abnormal noise may be noted from the HVAC blower motor. This can be caused by debris from the glove box entering the blower motor via the recirculation door. A screen is now available which can be installed over the recirculation air inlet to keep debris out of the blower motor.
Abnormal Noise From HVAC Blower Motor on Jeep Patriot
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no air circulation at lower fan speeds and loud hum when fan is on high and limited air blows. Going to remove glove box and hopefully I will find debris and remove to correct the problem, otherwise $$$$$$ again for this piece of junk Patriot !