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Many thermostats have a gasket installed between the thermostat housing and the engine block / waterpump. If the the thermostat is bolted securely - you may need to remove the thermostat and replace the gasket. While you're there - swap out the thermostat too. It's one of those "Two birds / one stone" kind of thing. See the "..Blown Head Gasket..." link below.
This car is hard to blow a head gasket but sounds like you overheated it too the point the motor stopped running, you will need to find out first what the leak was and repair it and also replace the thermostat due to overheating it, then fill with coolant and run the motor, if you have an overheating problem then have a block test done to see if the gasket let go.i ve worked on many that were overheated and they were ok, they just needed a thermostat and a waterpump that leaked or the impeller was rotted away, hope this helps.
I can't believe anyone would replace the waterpump without also replacing the thermostat. Once overheated, a thermostat is no good anymore. It must be replaced.
But that is not the only possibility. You could have a bad head gasket, without having oil in the water. Only a pressure check can tell. You could also have a collapsing lower hose, as water pump suction causes it to pinch off. You could also have an air bubble from not bleeding it properly when refilling. You could also have a loose waterpump belt. You could have put in the wrong waterpump, as the type for normal V-belts runs the opposite direction of the type for serpentine belts. There are many more, but that is all I could immediately think of.
Two possiblities; a blown head gasket, or a freeze plug leaking. If possible take it to a trusted shop and have the pressure checked on the radiator, they can tell you if your radiator is stopped up, or the freeze plug is leaking, and if it's blowing back in the radiator when you remove the cap then it's a blown head gasket.