My maintenance booklet says that:

Every 45000 miles/2 years
Replace recirculated air filter 8383
Model 140
Replace activated charcoal prefilter 8384

Every 75000 miles/4 years
Replace activated charcoal filter 8382

As I understand, my car has a recirculated air filter (or dust/pollen filter) under the glove box, and a activated charcoal filter, but does not have a activated charcoal PREfilter. (Please correct me if I am wrong.) If the above is right, then my question is: Where is the charcoal filter? Is it a DIY job to replace it? If it is, a few tips would be appriciated. Thanks.

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Harry (94 C280)