I don't suppose any of you know what this little white cylinder is on the B18A ?







It started making this odd noise yesterday when I started the car. Like it has something in there spinning once I let off the accelerator. I haven't taken it off and I have no idea what it is... so I thought I'd come and consult the holy bible :P

Here's a video of it making noise.

https://www.facebook.com/GaijinAerod...5090233515253/

Please help

All I did yesterday was change the coolant and bleed the nipple on the thermostat housing.