I think my van is low on 134A. I looked at the suction charging port and there was a note from the manufacturer on it that said something about it having dye in the system from the factory. Anybody know about this ? If so do I need special UV glasses or light to find the leak. Please advise.

 

The dye is for finding source of leak at joints,no special glasses needed.You should go to shop that does AC service as system might need purged.134 from gas to liquid for service..............