I have a refrigerant (freon) leak I need to find it

Not sure where yours is leaking from but, make sure you replace the valve cores on both the "High" and "Low" side before re-charging the system.
Had a guy at work (he did HVAC work on the side) tightn mine up and it worked for a year or so, but then I had to re-place the valve core(s).
Think I paid 3-4 dollars for the asortment pack at the parts store. Very cheap investment for when its 100 degrees outside.

I recently had the air conditioning completey replaced with all new parts except the condensor. Prior to replacing all the parts & adding freon the A/C would work for about two days and each time dye was added but no leaks could be found. The same thing is happening with all the new parts. It would work for two days straight then quit.
I understand there may be something under the dash the needs replacing but didn't want to spend more money unless I knew for sure.
Do you have a suggestion where we might find the leak. We have looked everywhere.

Thanks for any help you can provide.