It certainly CAN leak if the GASKET sealing it to the engine block is bad or the pump bearing and SEAL have failed. You would hear a failed bearing (squeal or LOUD chirp) and a coolant leak when motor is cold isn't too hard to spot either. Coolant can SEEP out through the breached gasket while vehicle is still. Thermostat housing leaks are pretty common also due to gasket failure..
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