Where is the passenger cabin air filter located?
These are generally located behind the glove box where the evaporator/heater core is located. Try dropping the glove box and removing it and you should find the filter.
Where is the heater core hose located?
It's a 2004 C240 sorry.
Looking for a Used C-Class in your area?
CarGurus has 25,229 nationwide C-Class listings starting at $1,950.
Search Mercedes-Benz C-Class Questions
Mercedes-Benz C-Class Experts