I've read somewhere that you should run your a/c system for 10mins every month to keep the gas flowing and the seals in tact.
I don't bother as I won't be keeping the car into old age (6+yrs)
The a/c system on the ST drains power very badly.
I don't use mine at all.
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2011 Focus 3-door Zetec 1.6 TDCi.
Previous <img src="/images/graemlins/stemo.gif" alt="" />s - 2006 Panther Black & 2007 Red. Gone and quite forgotten <img src="/images/graemlins/lol.gif" alt="" />