a3 big fan staying on
 

hi to put a long story short
had a new ac compresser fitted yesterday the garage had the car for 2 weeks
car came back yesterday with the big cooling fan on all the time even with key out of ingnition the fan was going so long like 45 min i had to disconect the battery coz the fan was smoking
i noticed the compresser turnes all the time when engine running is that normal ??
the garage now tells me that it maybe a faulty relay or something could this be true at the moment i have taken the 80amp fuse out so i can use the car
the car is going back in monday
just asking coz i think ther bulling me coz the fan wasent smoking wene it went in
its a audi a3 2.0l tdi sport 2004
any advise would be gr8
thanx:)