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See related link. It could be any number of things, you need to run some tests. Could be as simple as a blown fuse. Low pressure is probably most common. You may or may not have a leak that needs fixed (could be caused by a worn o-ring / gasket). Worst case you need a new compressor. You can buy a cheap gauge from harbor freight or take it to a professional.

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Q: Toyota Echo 2002-air conditioner blows cold intermittently?
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