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How is he checking for the leak? When he refilled the system did he add dye to the system? R-134a leaks can be hard to detect, the old sniffers that worked well with R-12 aren't nearly as effective with R-134a, so what they do now is add a fluorescent dye to the refrigerant, so that the leak can be found by shining an UV light on it. The evaporator does sound like a possible culprit since it really isn't in a spot that can be seen without taking the dash apart. For that much refrigerant to leak in ten days he should have been able to spot the leak if it was anywhere else but the evaporator.
The whining noise is strange though, do you have any more info on that? How loud is it, is it constantly whining when the ac is on, or does it whine just when when the vehicle is stopped and then go away while the vehicle is moving?
As for the trade in value of the car, I'm sure not fixing it would hurt some, but not $600 worth. I'm sure you'd be ahead moneywise not getting it fixed, but I can't put a value on your comfort.
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