Lets hope its the pollen filter & as luck would have it on the Zafira its quite easy to change once you remove the glove box (what an old term that is)
Edited by VFR - 8 hours 46 minutes ago at 7:35pm
Pays to hoover out the box as well once the filter is removed & I also gave the rad inside a good spray with air-con system cleaner before popping the filter back in as again quite easy to do.
Filter is around £6.00 ish.
Edited by VFR - 8 hours 46 minutes ago at 7:35pm