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

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?

Asked by for the 2001 BMW 325i
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....