If it is leaking coolant. And you changed the thermostat. I would then move to this section. Flush the radiator and the heater core. This can be done at a certified shop with a reliable mechanic.
There are all sorts of places that coolant can be leaking from. You just have to look until you locate it.
thermostat gasket probably leaking. replace thermostat and gasket making sure that thermostat housing is flat.
it could possibly have either a blown head gasket or intake manifold gaskets leaking
only if the gasket under thermostat is leaking and may-be it's the hose clamp on the hose that is leaking
Either the water pump impeller is loose on it's shaft, or you have a leaking head gasket.
is the vehicle over heating?changed the thermostat? or water pump may be gone,is it leaking by the pump?
Blown head gastet, radiator leaking, thermostat needs to be replaced Blown head gastet, radiator leaking, thermostat needs to be replaced
I would check the hoses leading into your radiator, and also the overflow for antifreeze. If that is not the problem, it could be your heater core. Your heater core might be leaking, you might have a hose leaking
Failed seal. Replace it.
possibly the water pump
I have a promblem with that too, my car would overheat very fast, it was a faulty NEW thermostat. It still runs hot, I think I need a new water pump