New Water Pump Leaking
A mechanical seal has a break in period of about ten minutes meaning that it takes about ten minutes of operation for the seal to properly seal itself.
New water pump leaking. A new water pump replacement must be performed for this symptom as there will be no remedy to. It is not uncommon for a new water pump to have some slight leakage or seepage of coolant from the discharge hole weep plug below the water pump pulley shortly after start up. Every mechanically driven water pump has a weep hole that might leak a little in the beginning. A weep hole leak or leak underneath the water pump will indicate a water pump failure.
Some seepage from the weep hole is completely normal with a new water pump. If it is leaking at the gasket seal the pump was either not installed correctly most likely scenario imo or the housing wasn t machined properly during manufacture. This is because the unique seal material in the new water pump is designed to bed in as the impeller shaft spins. If it is leaking out the front bearing the pump would definitely be bad.
There is no quick fix for this problem. Sounds to me like it was not done right.