as above had the same problem last year when the frost was out .They work fine any other time but in the morning when there is a frost nothing .as soon as the car warms up they work .Took it into vaux this morning but they were working when i got there typical .They phoned me later in the day to tell me they could not find anything so they have kept it and will try in the morn as it will be minus 6 here tonight .Has any body had the same problem and got it fixed .Thanks