When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
No expert here, but if you have dye in it and still can't find the leak (If it is leaking at all) the leak could be in the evaporator. You didn't exactly explain the problem though. Are you loosing refrigerant? Or does the AC compressor just not kick in?