John Deere 5420 Cab, no air on right side

[shearpin]

John Deere 5420 Cab, air conditioner has no air coming out the right side vents. Left side working fine. Removed top covers and found both left & right motors running fine. Could not see anything that would prevent air flow on the right side. Any suggestion as to what might be blocking the air flow only on the right side and how to access it to fix the problem?

 

[Tx Jim]

I'd suggest to raise cab roof,remove cover(parts key 1) and see where the problem is. Does your tractor have a window defrost setting?

 

[shearpin]

I'd suggest to raise cab roof,remove cover(parts key 1) and see where the problem is. Does your tractor have a window defrost setting?

I remove the top. Although I could see the fan turning, I remove the motor anyway. That痴 when I found the obstruction. Reassembled working fine. Tractor was purchased used in Sept 2013 with 749 hours, thinking I would have to replace a few parts fan motor or relays. Turns out only had to fix someone else痴 careless mistake.
Thanks for your time and suggestion.