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I want to repair my Volkswagen Passat '07 A/C. I've taken it to two shops (dealer and independent) and they both say the entire a/c system needs to be replaced. The strange thing is, that sometimes it actually comes on and when it does it works great. The rest of the time I can't get it to come on at all.

Is there a way to force the A/C to stay on when I tell it? I've heard that there is a limiter that keeps the compressor off when certain sensors are not reading correctly to protect the compressor from damage. In my case though they're recommending replacing the entire system so I don't see any problems forcing it to work until it can't cool anymore. Also does it make sense that I need a new compressor when it works great sometimes?

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What exactly does the entire system include? So far sounds like you need a third opinion. –  Larry May 12 at 19:29
    
compressor, Receiver/Dryer, expansion valve, probably the condenser. They said something about metal shavings in the system from a bad compressor. –  JMC May 12 at 19:41
    
Also to note, the dealership said they could get it working by just replacing the compressor, but that it would fail again over time if I didn't replace the entire system. –  JMC May 12 at 19:48
    
That sounds more reasonable, and if it had an internal compressor failure that's usually the course of action. But if it works sometimes it makes me wonder if it's an internal failure of the compressor. How do they know their is metal in the system? Did they see it, or are they assuming. –  Larry May 12 at 19:54
    
In reality i'm not sure about how the "know", but they acted as if they looked in the system. I never trust the dealership. The independent shop recharged it and that's when it started working intermittently. –  JMC May 12 at 20:00
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