If you've got poor performance from you heater blower and you don't know when your pollen filter was last changed (if you have one) then I'd recommend changing it. I changed the one in my partners 16 year old Micra 1.0 Profile, with 101k miles, at the weekend. The heater blower had been really poor and this was the reason. It looked like the original factory filter had never been changed as it was a Nissan Calsonic one and the access panel had never been cut. Here's a photo showing the old one and the new one before fitting. The blower works much better now.
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