Does this mean I have a cabin filter?

 

I have pollen filter in my 2004.5MY Convertible ! and this is listed on the build sheet as “Air Particle Filter” for the U.K. Market
not sure if this helps

 

Its possible. If yours has it, its under the cowling in front of the windshield towards the left side. My 97 had one. If its still the factory one, it kinda looks like a flat wasps nest. This was mine

 

I guess the only way to know for sure is to remove the plenum cover to check. I tried once before but couldn't get the wipers off.

 

Yes, the tapered wiper arm and shaft presents a problem with removal after many years. We solved this with a purchase of inexpensive tool from E-Bay vendor. Search for "tapered wiper arm puller" and many different types will be available. The one we used consists of a aluminum housing with U-slot at lower end and a plastic capped thumb screw on top. The lower U shaped housing slips around the tapered wiper post to capture arm when the screw is tightened down to press the arm loose. This does require one to remove the vinyl blanking cap first over shaft.
NOTE: Place a short strip of tape along each wiper blade on glass to use as a marker so they can be returned to original spot on glass. Remounted with anti-seize for future removal if needed.

 

I used a modified tie rod puller and penetrating oil I saw on To the Garage. It came off with some effort.
No cabin filter found!
Thanks to all for the advice.