They didn't blow. They both developed leaks. It eventually got so bad, one day the compressor ran, the X started to lift, the hissing started, and it never came up. Once the inactive light comes on the compressor shuts off. The remaining air if any, escapes through the leaking bag. This it what happened in my case. Hey it could be a bad line, but a compressor that works and then stops and hisses seems a little far fetched to me.

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2001 E53 4.4 Alpine White, Sports Package
2000 E36/7 2.8 5 speed Bright Red w/ a HT!