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I was fortunate enough to be able to use the shop compressor at my school. Then wait 20 min and flush it out with shop air.
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(Now that I think about it maybe glue would have been a better idea) The flushing proses I will not cover in detail, but all that you need to do is to spray a A/C flushing compound it the freon pipes. I used some packaging material and tape to hold it in place. If you already spent all that time getting it out the car its not a bad idea to replace the expantion valve and do the be best you can to wrap it in sum thermo insulation material. I cleaned mines in the shower, remember to be really careful not to get water in the pipes which freon runes through. Once you have the evaporator out the car you may find it to be very dirty. The pictures below cover the most difficult part which is the get to the expansion valve.
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Mixing oils or refrigerants will result to what is reffed to as as black death by mechanics. Also if you are retrofitting your system from R-12 you will need to flush out all the old mineral oil as oils tend not to be compatible with each other. If you decide that the A/C system needs to be flushed in order to remove debris and oils you will need to remove the compressor, expansion valve, and the drier. If you can't get your a/c to turn on then use this chart to determine if you are low on freon. Check for excessive duct hose length, kink or bend. Evacuate and replace drier Frozen Evaporator Coil 1. Add refrigerant Evaporator Not Cooling 1. Low Refrigerant - low pressure switch has cut off clutch power Repair 1. Replace head gasket Compressor Not Working 1. Leaking head gasket on compressor Repair 1. Trash in expansion valve or screen Repair 1. Center and check distance Low Suction Pressure 1. Condenser not centered on fan or too far from radiator Repair 1. Replace reed valves High Compressor Discharge Pressure 1. Example if it's 90 degrees F, high side should be no higher than 225PSI Here is a useful trouble shooting chart for systems currently running on freon R-134a Trouble shooting Low Compressor Discharge Pressure 1. High side pressure in PSI should be about 2.2 to 2.5 times outside air temperature in degrees F. The condencer is located in front of the radiator.
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When running the car at idle to check the freon level it is a good idea to have a water hose handy and spray water on the a/c condencer. Remember that these are a guideline and your actual temperatures and pressures will vary depending on humidity in the air and the condition of your system. Here are some general guideline for A/C system pressures and temperatures based on ambient outside temperature. You will need a set of manifold gauges to check you freon pressure.