Help! Bad smell from vents with AC
 

I have been noticing a strong unpleasant smell when I run the AC.
It has been upgraded to R134, but I don't think this is a factor. It smells like rubber hose like you have just walked into a tool store. There is no smell when the heat is on. Center vents work. Also, over time there is a very slight film deposited on the inside windshield over the defroster vents. I am not losing any coolent or freon. I also see very small particles of some black material blown out of the vents.

Where is this coming from? Someone told me that there is a horse-hair filter of some kind deep in the dash - maybe under the heat exchanger but I don't know how to confirm or repair this. I don't want to just spray it away, but would rather know what the problem is and fix it.

I am willing to remove the dash if necesary.

Please don't take off the dash yet.... LOL
Try turning on the AC and spraying Lysol spray into the INTAKE of the AC...... keep your doors open ... LOL... don't want you to overdose on Lysol...
Put plenty in... .and do it several days in a row... have blower on low speed....