2011 Ford f 150
For a couple of years I’ve had an issue with the high speed fan setting on my truck. After a while, all speed settings started to fail. The blower motor would make this weird moaning sound and no air would come from the vents. After looking at different problems online, I decided the fix would be to replace my blower motor resistor. Once replaced, my problem was solved until a few weeks later, I had the same problem again.
Today I removed the blower motor and ,while pulled out of its cavity, the motor worked perfectly on all speeds. Once secured back into its cavity, the moaning/no air flow would start again. Does this indicate a blockage somewhere in my vents/air intake?