1995 z71 a/c leak search

[daniellane]

I've recently had my a/c stop working in my truck. I've replaced the low side accumulator switch, accumulator, low & high valve fill ports, most all of the seals. ran leak detector through it and found nothing around the r4 type compressor. will not hold a full vacuum at full pressure for long on the low side gauge on our machine. any ideas of where else could be leaking?

 

[daniellane]

Bump.

 

[Marcos]

Check underneath your dash with your leak detector, maybe the evaporator core is broken.