how to fix air con on my scenic?

my reno scenic 19 dci had its fan housing opened up to remove debry..ever since the air con and relevent switch light as been dead.i dont know if they left a wire or plug disconnected, ive had a little look,had glove box and steering column etc out, and checked every fuse i could find .even under the seat , but dont realy know where to go from there.and cant afford to spend much now ive lost my job...the garage that sorted fan, did so under the warrantee from when i bought it, and dont want to know trying to say it couldnt have been working before .but it definatly was ..any ideas please on what it probably is