Had the tqs over a year now and it's never had a drive belt on the air con compressor. It was like it when I bought it and I don't know if the belt was taken off or fell off or snapped or what the crack with it is generally. The tensioner wheel turns freely as does the pulley wheel on the compressor.
What do you think the chances are of it all working if I throw a belt on there? or do they tend to be knackered with non use after so long?