my copper lines freezing on central air unit.
the unit stopped working completely - did it freeze up?
Yes if it does not have a low ambient kit on it
Your air conditioner compressor may be seized up. If it is seized up the belt would lock up every time you turn on the air conditioner, causing the car to die.
If you mean freeze as in ice up it is probably low on freon.
No, it's not your fault. It's just running too much. Often this can happen due to the level of refrigerant in the air conditioner being too low, perhaps due to a small leak. The air conditioner should be checked out by a reliable cooling repair person.
First determine the symptoms the air conditioner is having. For example, does it have power, is the fan running but no cold air, is the cold air not cold enough? Then you can look up possible causes on the web in sites like http://www.repairclinic.com/Air-Conditioner-Troubleshooting?red=Air-Conditioner-Repair-Help
When you are running your air conditioner and it stops then the air conditioner is froze up. You have to cut it off for a while, and let it warm up. You have to turn the thermometer between 70-75 to keep it from freezing up.
sounds like your A.C. compressor clutch is locking up
Central of course because it is larger.
The evaporator coil is starving for refrigerant. Basically what is happening is the refrigerant pressure/temperature is low enough to cause the humidity in the air to freeze on the evaporator coil. This cause a air restriction, hence insufficient to no indoor air flow. Usual common cause is a low charge of refrigerant or a restriction in the metering device, although not the only possible causes.
Because a fan only stirs up the hot air while an air conditioner removes humidity as well as cools the air.