I have a ac leak on my 03 neon sxt that i can't locate. The ac had a very small leak and would hold the charge for months, Recently it has become larger and will drainalmost all of the r134a by the next day.

Things i have tried,

Changed the low side valve core (Schrader valve) due to seeing bubbles-Leaked out the next day

Ac recharge-Leaked out the next day

Red dye/stop leak in a can Interdynamics (LDS-1) -Can't see the leak on any of the lines

Soapy water in bottle-No leak detected!

Could it be in the evap core? If so how would i know before having to pull the whole dash to replace it?

 

I have a feeling it's the evaporator since you were not able to find it. Don't they make a product that when it leaks out you can find it with a black light?