If it's the evap that sucks because you have to pull the dash. I've got a sloooow leak in mine. Pressure drops in the system or system doesn't cool when it should. By slow I need to add top off my system once or twice a season. Once at the beginning and once mid-way through. Get a few cans on sale $5 or full price of $9. 15 minutes or so to top off the system. Beats the trouble of pulling the dash. When the leak gets too bad I'll bite the bullet.

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92 300D 2.5L OM602 OBK #59