AC Noise from Vent

[kpierce]

Hello,
I have a York A/C system (Model #G2FD060H24G) and now have a noise coming from just one of the vents.. It is the vent closes to the unit in the attic. I have inspected the unit and can't find out where the noise is coming from. I have pulled off the front panel and do not see anything in there either... How or can I access the magical silver box that all the duct work is attached to. It appears to be all covered by black 'tar'. I am sure that is the source.

Sounds like just something is loose..

Any advice is greatly appreciated.

[HayZee518]

normally where you have a rigid duct connected to a (movable) duct you'd normally use a vibration transition fitting which is nothing more than a rubber membrane in the form of a duct (round or rectangular) and this is connected between the two ducts. check to see that it isn't rubbing metal to metal, there should be some space between the two.

[kpierce]

Thank you for the quick response.

I see that the duct work is all covered in what looks like black tar around the joint. So I plan to cut a line in this and remove the duct work from the unit. I am sure that will show the problem. However, what is this black tar?? I would prefer not to just 'duct' tape it back if there is a better solution.

thanks