Why's my vw Passat b6 heater not working?

Do You have any airflow at all coming out of the vents on our Volkswagen Passat B6 If You're not feeling anything at all, that's going to almost certainly be an issue with the blower fan. The first thing You should check is if the fuse for the blower has blown; if there was a short or surge in the system, the fuse takes the damage so the motor doesn't. If that's all good, then it's possible the blower fan motor itself has failed; it could be that it's no longer getting power, if the wiring harness has been compromised, or that the motor itself has burned out. This does happen over time. You can usually find a replacement part on eBay (used) for between $40 and $120, if it turns out You need one.