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I have a 2000 beetle 2.0 and have overheating problem. first time was due to water outlet cracked, replaced it, worked great for a week. overheated again. replaced thermostat still overheating. have been searching for answers and found there could be air in the system, how do i purge the air out the cooling system.
 

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It helps to have a vacuum coolant filler tool; like the UView 550000 Airlift Cooling System Leak Checker and Airlock Purge Tool Kit.
It will remove air pockets in a snap and pulling vacuum will test the system for leaks. Amazon has a good price on these but any shop; should be able to vacuum fill and test your system for leaks.
Have you confirmed that your water pump is in good working order?

http://www.amazon.com/s/ref=bl_sr_automotive?ie=UTF8&field-brandtextbin=UView&node=15684181

troubleshooting tips:

Check for flow in the coolant tank and you can also check the impeller ; if you remove the thermostat, the impeller is exposed and can be checked with your fingers (is it spinning on the shaft, is it cracked and in pieces?). If you are not getting any coolant flow; back into the tank, make sure the coolant return hose isn't clogged, this can also make air pockets hard to remove.

Check out his videos for some ideas and troubleshooting tips:

http://youtu.be/H_7De5aU4dI

http://youtu.be/ZcoT1oFr74g
 

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purge

You don't need to purge the coolant on theses cars if the flow is circulating correctly as the air bubbles will purge themselves at the reservoir round tank, you'll see the reservoir level go down as the air purges out displacing the coolant level there. Then just keep adding a little distilled water to bring the reservoir level back to normal operating range. Sounds like you have a bad water pump impeller or blockage at the small hoses connecting to the round reservoir tank, common issue in these system.
 
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