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is there dye in the system? if so look for this dye under the car at the evaporator drain along with the condesation runoff. if not use a sniffer run down the middle vents and stuck up the drain tube.
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If you don't detect leak with sniffer or with dye as mentioned above you could still have an evaporator leak. I've replaced evaporators on three 124's in the last 2 months and only one had dye come out of the drains. It also lost the gas from that system overnight, i.e., less than one day. On the other two I could not find the leak. On both of those it was obvious the evaporator was leaking once I had the evap out of the case.