Smell when A/C is on fan

Question

What is it? Where does it come from? Is there something wrong with it?

Answer 1

kind of a cow pasture like smell? your evaporator is probably starting to leak.

Answer 2

See if the vent for outside air is open, it could be coming from outside.

Check the filter, that filters the circulating air indoors. It is in front of the widow unit and intake on the central unit. Wash and deodorize the window unit filter or replace the central unit filter.

If it smells like something burning, your blower motor could be overheating.

Get the system serviced by professionals.

Answer 3

could be the evaporator coil in the a/c spray Lysol in the return to freshen up.