Any body know about A/C system leak detectors? I now have a working system on my Crown Victoria except the R134a leaks out. I'm willing to buy a leak detector but do not know which one will be right. Should I just get the stuff for injecting dye or a $250 leak detector? They throw around some terms I'm not familiar with. "Heated Probe", "Maintenance Kit", "Pump style probe". I have most all the A/C tools needed but do not know which leak detector to get. I'd like to have one that works, professional quality preferred.