Plastic in the 1990s was more brittle than today. Even back then, my 10-15 year old Ford had issues with the vents not easily moving, then breaking from force.

Plastic in the 1990s was more brittle than today. Even back then, my 10-15 year old Ford had issues with the vents not easily moving, then breaking from force. More modern cars of decent build do not have this issue.