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This is a mk3 passat specific writeup - cold chirping noises on other cars is probably something else.
http://www.myturbodiesel.com/1000q_how_to/a3b4/passatchrip.htm
Basically, remove the harmonic balancer, replace. The old design wears out and makes it sound like a bird is panicking under the hood. Although the tensioning spring is suspect and could be contributing to the issue, the real problem is the pulley. Replace with a new tensioning spring, details in the writeup.
http://www.myturbodiesel.com/1000q_how_to/a3b4/passatchrip.htm
Basically, remove the harmonic balancer, replace. The old design wears out and makes it sound like a bird is panicking under the hood. Although the tensioning spring is suspect and could be contributing to the issue, the real problem is the pulley. Replace with a new tensioning spring, details in the writeup.