Reddit reviews LotFancy Freon Leak Detector for Halogen Gas Leakage, Refrigerant Leak Detector HVAC for CFCs HCFCs HFCs R134a R410a R22 R11 Tester, High Accuracy, with Indicator Light
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Excellent sensor with maximum sensitivity of 6gr/yr, the Freon leak detector detects all kinds of halogen refrigerants including but not limited to CFCs e.g. R11, R12, R13, R113, R114, R500, R502, R503 etc. HCFCs e.g. R22, R123, R124, R401A, R401B, R402A, R403B, R408A, R409A, R414B, R416A etc. HFCs e.g. R23, R134a, R404A, R407C, R410A, R417A, R422A, R422B, R422D, R507, R508B etc. Blends such as AZ-50. HP62. MP39 etc.Real time sensitivity, refrigerant Freon leak detector can be automatically adjusted to the best optimum detecting stateFlexible probe can reach to almost any awkward corners or space; More stable gas leak detector with precise ultra-low power IC designTricolor display of battery voltage; Siren sound and flashing light for the leak alarm indicator. Make sure to put 4 x AAA alkaline batteries in it. Please pull out the battery holder and install all four batteriesWe offer 100% satisfaction guarantee and one year warranty
Check the water that drips from your AC for Dye. If that's got dye, that'd def your evap core.
There are refrigerant detectors (see /u/Vistandsforvicious 's post). You turn the AC on, and it can detect very small refrigerant leaks. Most AC shops should have one. They look like this And basically sniff to find very small leaks. Beeping when stuck into your vents when the AC is running means your evap core is leaking, no beep... no leak. I'd suggest getting a professional to do it, not the crappy one I linked. Or you can roll the dice and use the el-cheap-o from amazon.
edit: But if it's a leak, you should be able to do it with 0 guesswork involved. It just takes a lot of persistance. Use a q-tip to clean up that spot of oil on the back of the compressor, and see if recharging it makes the oil spot come back.
PS: If you're adding refrigerant, do not use the crap with leakstop. Use something like this with the white cans of only-refrigerant to fill your AC. If you're refilling it yourself, I wrote a long post on how to do it mostly-correctly.