Was working on a walk-in cooler yesterday that had a leak. Pinpointed the leak to the evap with my D-tek, but couldn't find the exact leak point. Sprayed entire end of evap ( u tubes, TXV, distributor) with super blue bubbles, no bubbles. Reduced pressure from 110 pounds to 35. Again sprayed bubbles, no bubbles. Down to 5 pounds, again no luck
Alright, enough of this. Cranked pressure back up to 110, went to my truck and grabbed my buried halide torch (cant remember the last time I used it), to evap, and bingo, found leak asap! Im thinking that I may start using my torch a little more often.