Thanks for your reply, the fan actully works and I dont have a circulation button on my car or air con,dont really need mutch air con in U.K
it just seems when I put the fan on there is no flow coming though the vents or very little flow like if somthing is blocking them, ie:like if someone was squeezing a pipe to stop the flow of somthing,I just wondered is there a filter within the vents that could be blocked anymore info would be a great help
Thanks