My A/C was cold, but I noticed the pump kept clicking on and off every fifteen seconds or so, I charged the system with a can of freon, and that seemed to stop it for a while, but then it started up again after several days. I measured the temperature at full blast--between 38-40F. I put the gauge on it and when the pump clicks on the pressure reads exactly 24, right at the low edge of normal (between the green and blue). When the pump kicks off the pressure rises to 45, right at the edge of the blue/yellow. But no matter what temperature I set the climate control at, I can hear the little relay behind the glove box clicking on and off every fifteen or so seconds. I can also feel the car hesitate ever so slightly when the A/C compressor engages. Is this normal operation for the A/C system? I don't know whether the system was actually low when I put in a whole can or not. On the low side it read into the green before I charged it, but when the pump was not running it would still read almost 45 and then the compressor would kick on, as it does now. Do I have a leak? I don't think my magnetic clutch is going to last at this rate. Dick