The air vent keeps jamming

Because I can not simply leave the air vent in this condition.

I have an air vent in my house that is always jamming! You know, the air vent that goes to the central heating and air conditioning system. The air vents in my house other than this one are all good and fine. But it is this one air vent that jams right in the bathroom. It started when the central heating and air conditioning system was pumping out too much air and it got real cold in that bathroom. I had to then close the air vent for a bit. And ever since it always jams when I try to open or close it! I really am the one that messed it up most likely. I am trying to avoid having to call the local heating and air conditioning company to send out a certified heat and a/c specialist to fix the air vent. But I think this is going to have to be my next step all together. Because I can not simply leave the air vent in this condition. It is making the bathroom the complete reverse of the indoor comfort that it needs to be. Because I need quality heating and air conditioning in the bathroom. So I think tomorrow I am going to finally cave in and make that one and only phone call to the local heating and air conditioning company to have them send out a certified heating and air conditioning specialist to repair the bathroom air vent of my central heating and cooling system unit. It is something that just needs to be done as soon as humanly possible! I should have done it much sooner but what I can say?

air conditioning expert