Ac unit outside running and unit inside running but no air flow through vents. Why?
A good place to start is with the return air filter, check to see if it is dirty, if so replace.
Also if your evaporator coil is dirty, air cannot pass thru the fins and across the coil, or your duct work may have come apart, I would recommend checking filter first, if this does not resolve the issue, look outside at the large copper line, if ice is present, your system may not be fully charged, possible leak in a line or coil, either way , you will need a pro to repair the system because of EPA laws and also the specialty tools required to make said repair.
One other possibility is the evaporator coil is plugged , this would require going into attic where heater is located and visually inspecting the coil, if you are mechanically inclined and can open the transition between the heater and the coil, then you can do it yourself.
1. Turn power off to unit.
2. locate screws along edge of coil and remove. ( usually 1/4 or 5/16 hex chuck on cordless drill should do the trick.)
3.Carefully pull apart along seam, may need box knife if taped.
4.look at entering side of coil with flashlight, if you notice a blanket of dirt dust across coil and do not see the fins, you will need to clean it.
5.use a stiff brush like a toilet brush to remove the majority of the debris from coil with firm and gentle downward strokes, then spray coil with formula 409 (a great degreaser !!) and re assemble duct, be careful where you screw the screws in at,put back in same holes if possible.
6. tape seam up with a good duct tape to prevent air leaks.
7. turn power back on to unit and enjoy the cool air!!
Don't worry about the 409, the coil will sweat and rinse itself!!
If you have electric heat, then there will be a box coil,again turn power off!!
you will remove the side cover, and if an a coil, another inside panel,otherwise the same as above to clean.
Hope this helps, if you have any questions, please ask,
Jun 23, 2011 |