See if this helps. I know it's for different year model, but may lead you in the right direction.
https://www.autozone.com/repairguides/VW-Passat-Audi-A4-1990-2000/COMPONENT-LOCATIONS/Passat-1-8L/_/P-0900c152800c2d27
SOURCE: I dont have heating in my passat gls 2002. any
do you have a 2.8 v-6. If so i hate to be the bearer of bad news but most likely it will be a clogged heater core. Take a look at you coolant bottle reservoir is the coolant a dark brown crusty color? If so that means that all the build up from the bad coolant has plugged your heater core to the point that it is not flowing anything thru it. That will be about a 1000 dollar repair. sorry for bad news
SOURCE: Location of Oxygen sensor Bank 1 # 1 in a 2002 VW
could be the lambda probe located on the exhaust.
SOURCE: 2002 passat wagon help?
My personal suggestion would be to go for these repair catalogs. I know this website www.reliable-store that i used to buy them from, and they sold online it was very good manual. Go ahead, I bet.
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