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Q: Do you have issues with your A/C on 2000 Mercedes-Benz ML55 AMG

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Have you or anyone experienced issues with your A/C with this type of model? I had own my vehicle since 2005. Never had to place feron in it until 04/2011. During that time it was checked for leaks and was informed that everything was perfect. Anyhow, I took my vehicle to a Mercedes dealership in Orlando since I was informed it is considered a classic and all of my cost will be 1/2 price and I needed my service B completed. Literally, less than 2 weeks my A/C stops working in 01/2012. Took it back to the same Mercedes dealership in 03/12 b/c now it is getting hot outside. They inspected it, found no leaks, supposedly recharged and placed 1.7 lbs of feron in the vehicle, and dye. Get 2 weeks, my vehicle was blowing hot air. Yesterday, 03/26/12, took it back to mercedes dealership, they claimed no trace of leaks or electrical problem, but I have an exp. valve that is leaking the feron. This valve is visible to the naked eye, yet they were not able to spot this significant problem before Strangely, I didn't see any yellow coloring from that area of the value or anywhere underneath the hood as they demonstated. Only dark oily substance around the valve, which they claimed caused the leaks. Is it me, b/c that doesn't make sense. Any one with this model experienced A/C problems that could give me some advice? Thanks!
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This senario could happen with any car. Refrigerant is oderless and colorless. When it leaks it leaves very little if any trace. The smaller the leak the harder to find. Trace dyes help some but are not always effective
in finding leaks. Also they are a florescent dye and a black light is needed to locate or see it light up so to speek. The fact that you see a oily substance at that valve is a strong indication that it could be the source. I have my best luck using a electronic leak detector (called a sniffer). Due to the age it is not abnormal to develop a leak at this stage in the game. Likely when they serviced your car the only check would be to turn A/C on and verify that system was working. In cooler weather a system that is low on charge may seem to cool normaly but when it gets warmer it would be more apparant the system is low and not cool well. Sounds like a oversite in the service bay.
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