It's illegal to put refrigerant in a leaking AC system. As part of their routine they go through they test for leaks before refilling.
It's £20 during the winter and £40 during the summer.
It's all done by a machine, all they need to do is choose the right model of car on screen, then follow the pictures on screen to connect to the hi and low service ports for the AC system, then the machine does the rest -- recovering the existing refrigerant, weighing what's been recovered, refilling the right amount of oil and refridgerant according to the database on the machine etc.
It's a steal.
Edit: I think if it recovers less than what should have been retrieved according to the machine's DB, it doesn't refill to what's specified in the DB, it refills to what was recovered +10% -- don't know the logic / reasoning.
Last edited by: CraigP on Mon 19 Apr 10 at 20:01
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