Air Conditioning - Narrowing down the problem with my Air

My central air will stop blowing air, the lines will frost up, and there is alot of condensation on ducts. The filter is replaced once per month. Replaced blower motor, and replace unit outside. What could I check next. Sitting here today and all morning the air will not blow.

If the line outside is frosted over then the coil inside is frozen over thus no airflow. When did it start doing this?? Before all the work you've done or just recently?? Have you checked the indoor coil or was it also repplaced with the outdoor unit??

Don't let it run frozen over. You will ruin the compressor.

if you have done all this yourself and still have not corrected the problem, its time to call someone that knows what they are doing.

wolffpack,

You will need to determine why the motor is not running.
Regardless of the motor being new it could be bad or something in the control circuit is not energizing it.

You might be able to get some idea if when the motor stops, wait 20 minutes or so and see if its hot.
You will need to turn the power off to the furnace and be very carefull in case the motor should for some reason start on its own.
Other than this you would need to use an electrical meter to diagnose it any further.
If this is not up your alley, calling in a service person would be a good idea.

The ac was doing all those things I mentioned before all that work was done. I rent a town house and the repair man they hired to take care of the complex seems lost. I appreciate your responding and I'll have him check the coil. What would we be checking for? Blockage, corrosion, I'm not quite sure. Just so I can help steer him in a direction that may fix the problem.
Thanks again!

Sounds like low airflow across the evaporator coil probably caused by dirt buildup on the evap coil fins blocking airflow, have the maintanence man do a thorough cleaning of the coil and you should be good to go, if not you may have a refrigerant charge level issue (low charge) and that will require a tech trained in the art of black magic (oh you know refrigeration)

wolffpack,

You know, I've re-read your questions and others solutions and now it is not clear to me exactly what the symptoms are.

You say "My central air will stop blowing air, the lines will frost up, and there is alot of condensation on ducts."
I take this to mean the fan motor stops then the coil frosts up.
Is this so?
Or, does the coil ice up causing the airflow to stop?

If the fan motor is running and the coil ices up it could be dirty or low on refrigerant as was suggested.
If the fan motor stops then the coil ices up you have a problem with the motor.

Which is it?

excellent point greg Note: just killing time here I am trying to get all the latest posts covered with my name LOL this is fun, but short lived, I just got a emergency 911 call my neighbors car will not start have to run will be back later on. Have a goodunn