The thermo valve of the heater coil inside the tank leaks and causing coolant to leak into the washer tank.

Before the leak started, I have also been observing that the washer maybe continously evaporating so I also suspect that the thermo valve is stuck open.

Is the thermo valve a replaceable part? Also, there are rubber seals connecting the coil to the thermo valve housing. Are these rubber seals replaceable as well?

Thank you...