First of all I wanna say I'm new here , so hello everyone and thanks for any help . There is indeed a lot of info here and seems to be very helpful people also ! Ok , to my question .. Went to check a unit today at a home and noticed that the condenser fan was running and the compressor would try to start but would not . I took the cover off to access the electrical and noticed first off that there was a DST-6 Torque Plus crammed inside . I pulled it out a little and noticed that it was leaking on the bottom .. ( awful smell to this stuff ) I don't know a whole lot about these things but guessing with this leak it has lost its charge ? Do these work like a large battery ? The capacitor on this unit is 35 uf just so you know . Thanks everyone !