[lowminitruckin]

where is the cabin air filter on a 01 impala

 

[wedebrook]

under the wiper cowl.
click this link, then click on how-to.
http://impalahq.naioa.com/

then scroll down and click on the image that says
Want to know how to change the Passenger Compartment Air Filter? Click on the filter and see.

 

[Lingenfelter]

Haha, pretty much what I said here:
http://www.impalaforums.com/chevy-impala-7th-gen-discussion/238771-water.html