Like most folk here I have my aircon running continuously - the car is a 1996 960 3Ltr 24v with climate control, so it just keeps the car at the nice comfortable set temperature whatever it's doing outside. Running the aircon frequently keeps the system healthy and my system, at 22 years old, has only ever been recharged once, seven years ago when I had the compressor replaced. I check the charge every spring, but it just never seems to leak any refrigerant (now I've put my foot in it - it'll probably fail on me now!). As for the effect on fuel consumption, my car seems to be as fuel-efficient as is expected for a 3Ltr 960 and I've never really found it a problem.
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