Floor heat not splitting 50/50

With the recent cold snap I had complaints that the floor heat isn’t putting out on the passenger side. So I hopped over there and sure enough it isn’t. No heat at all.

Had anyone ever dug into the little flapper in the lower ducting for repair? Just how difficult is it?

 

Have you ruled out the ever popular rodent nest ??

I never moved mine from defrost that is all I ever use.

 

Not a nest. I’ll take a look in a few days when I do the door handles.