05 2.0d Multi vee drive to air con compressor - former farmer
When I found the air con not operating, I found the drive belt from the crankshaft to the compressor had come off. Is there an adjustment for the compressor to alter the tension of the drive belt?

I cannot figure out how the belt came off the pulleys, as it was too 'tight' to slip over them and operate the key to crank it back in to place.

Space is at a premium under the covers which makes access difficult.