Air Conditioning - Inside Unit Icing Up and Dripping Water

I've got a Trane unit inside my house, and just noticed that the condensor coils are icing up and dripping all over the place. I thought that it might be a blocked drainage tube, so I opened the unit and put a little bleach down the drain tube, and all water seemed to drain out fine.

I turned the unit back on and its icing up and dripping again. I haven't had the coils cleaned in a while, so my question is, how do I do this? I'm pretty handy and would rather do it myself. Can anyone give me direction or send me to a website that can thoroughly explain this procedure?

Thanks!

How's the air filter? Blower running a good speed? If yes, then sytem maybe be low on charge. Be best to leave the cleaning to the Pro.

Turn off the unit now before you do any water damage to the furnace/air handler.

I agree. If you have the correct airflow over the evaporator and the unit is working against a heatload (warm inside), it should not ice up. This is most likely short of refigerant or perhaps a partial blockage in the liquid line.

Shut the unit off, take off the panel to expose the coil. Get some Evaporator Coil Cleaner in a can from your local Lowe's or HD. Spray they coil down thoroughly with the can spray and then let it do it's work. Also get a stiff brush like a paint brush and brush off the coil buut sure not to bend the fins on the coil. You do not need to wash off the coil the condensate will do that for you but clean up the loose dirt now in the drain pan with a towel or a vacuum so it doesnt clog the drain later. Make sure you change your filter regularly and do not set the thermostat below a temp the A/C can actually reach. i.e. do not set it at 65 if the unit can only cool the house to 67 as the unit will run non stop and freeze up.

If this doesn't fix the problem you coul dbe low on freon, and make sure you dont have any collapsed duct.