First things first, thank you seatkid for your guidelines on the pollen filter. This made a complex task much easier, but, as I think you suspected, didn't fix the problem. Aircon blows cooler air - now that the ambient air temperature has fallen to reflect the loss of summer. The label on my 1.9 tdi ghia(no roof vents) shows 70 and 105 - is this for for one and two compressor systems? If so Kwikfit appear to have fitted the correct amount although my confidence is low! Thanks again