conditioning

I took my car in today for it's 3rd year service and the dealer has just phoned to ask if I want my air con servicing. It costs about £120 depending on how much refrigerant they need to put in. I said no as it still cools as well as my freezer. Should I have gone for it now or should I get a...

Its been quite warm this afternoon, so I dropped the climatic control down to "Lo". I noticed that the cold air coming through the vents wasnt as cold as norm. I'm now starting to question myseld about the cold temp. Is there anyway I can check this? What should the temp be?

Ok, got in my car this morning and the outside temp was reading -7.. hmmm its not that cold! anyway my air conditioning wouldnt turn on, would that be because it is saying -7? And its too cold for it to turn on.. And A/C only works when the outside temp is warm/hot?? Faulty temp sensor in...