Hi, I have had the same problem with my '98 Passat. The cause is probably a failure in the thermo-fan coil or circuit. When the thermo-fan is broken, the air conditioning will be overloaded due to the lack of airflow and will cut out. I have found that if the air conditioning system has been recently re-gassed, it will work during highway driving, but not during low speed driving while there is no airflow.
I'd suggest fixing the thermo-fan first, then re-gassing the air con, see how you go from there!
Good luck
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diagram for 1999 chev subarban air conditioner
http://www.tobio.info/passat/howtos/passat_air_filter.html
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the air conditioner and heater are two separate things.(not connected) ;) it may have a fuse. or the it could just be bad.
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1999 E320 air conditioner work on first and second speed, after 3rd blow warm air. AKINOHD@YAHOO.COM
This was my original search question..."Why did my air conditioner stop blowing on my 2000 VW Passat." But wiki changed the whole thing and then posted it! Don't bother anwering.
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You need to to add more conditioner fluid in the system.
the air conditioning cycle
1999