Mk4 or 3 Astra? Mk4 located behind glove box. Need torx headed screwdriver/very small screw driver. Horizontal cover to take off after glove box removal, think it's a 7 or 8mm ring spanner that holds cover on. Slide out old pollen filter & practice replacing old filter first, before new replacement. Saves creasing new one :-) Hope this helps?
Should take around 30 mins.
George.
May 2009