i'd recommend you hold your horses on buying a new compressor for now. the whole function is a pretty simple "if this, then that" scenario. like "if ride height is low, start compressor until ride height is ok". so obviously there's something stopping that from happening. if the compressor works on your bench, there's no reason why it wouldn't work in your car, so the problem is further upstream. have you checked that the level sensors are all working correctly? at this point it's probably wisest to plug into the OBD and try tracing the fault through there instead of blindly throwing more money at it and hoping that it miraculously gets fixed.

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