2003 Volkswagen TDI AC Works Sporadically

For the last month, when I turn my air conditioning on, it will blow cold air for about a minute before it stops blowing any air at all and has a faint ticking sound that sounds like it's coming from the blower motor. This is true whether I turn it on full blast, medium, or low. When I turn off the air conditioning and wait for a minute or two, and turn it on again, the problem repeats - it will blow cold air for about a minute before it stops blowing any air at all and starts ticking. I can go on doing this indefinitely.

Any thoughts? Thanks!