mine clicks and didnt blow cold air for a while. if u still want the cold air just turn the temp to max the lowest and keep doing it for a minute or so. read up on here to do it and it worked for me. sometime a flap gets stuck to just let in warm air.
it hasnt gotten rid of the clicking sound though. if u have the time id say pull the dash off so u can see everything, start the car, find the part and ask ur air con or sparky bloke for a replacement part. ill have to do it sooner or later too. lol