No idea. No t possible in my view from the video.

Could be anything.. no audio direction and a lousy recording.

Agreed. There seems to be a rumbling on the audio, but it really can't be isolated from a mono recording on a phone.

You need a garage. One that actually employs mechanics, rather than fitters.

Yes its the hissing sound I am querying, defitnetly coming from around the belt area.