CABIN AIR FITMENT DIY
To assist in your DIY efforts here are some step by step images that show you how to change cabin air filters in some of the more common locations:
FITTING INSTRUCTIONS FOR CABIN AIR FILTERS FITTED BY THE PASSENGER SIDE WINDSCREEN COWL (NO. 2)
FITTING INSTRUCTIONS FOR CABIN AIR FILTERS FITTED IN THE ENGINE COMPARTMENT (NO. 3)