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How quick / slow can an evaporator core leak take form? on 2001 BMW 325i

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I was told my 325i BMW had an evaporator core leak. I took it to another shop that claimed it is the hose(s) and fixed it. A month later the a/c stopped working, NOW they say it is the core. Could the leak have suddenly happened after the hose(s) were replaced?
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depends on the severity of the leak. Approx 3 weeks +/- before a difference in cooling efficiency is detected. Evaporators are very common in E46, i have never replaced a hose but many evaporators. Anything is possible, it could also be a combination of the two and the easiest and cheapest option is chosen first and improvements are to be monitored by the customer.
Thanks...I have a diagnosis in writing from a shop listing the issue as an evaporator core leak but they didn't have much BMW experience so I went elsewhere. South Florida is FULL of rip offs so it's likely they lied or were incompetent. I would have to pay for labor all over (the big problem) so I'm suing them for my $1100. Hopefully, I will win. Is it uncommon to replace the hoses? It's 2001 with 82k miles....