90% of the time when my blower for the heater and A/C, in the cab of my 2005 ram has a whine or a loud HUMMM, it getts louder the higher speed itd on. Has any one else had this problem and what was it. I think its the blower motor going out, thanks

 

The recirculation/fresh air mode door is broken.Take the blower motor out and reach up into the hvac box,you'll find the door & the other piece of the door will be in the blower wheel.

 

I will try that and get back with the out come, thanks for the help.