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The below are all you have to worry about, Yellow need not be wired to Y at the air handler as it is a dummy trminal for convenience, many simply run Y from the stat to the AC unit outside bypassing the Y terminal on the air handler.


If the lines are the same temperature, that means they're at the same pressure. Which is normal when the system is not running. Once the system starts, the pressure in one line should go up, while the other goes down. Since the pressures in your system are basically equal, I'd say the refrigerant is low. You can verify this be connecting a set of gages ...

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