Without knowing what engine you are talking about, I can't say for sure but I'm going to guess that on your engine the timing belt has to be removed in order to access the water pump. whoever did the work probably put the timing belt on wrong.
brilliant, the thermostat is backwards
Cracked.head
YES
If the pump is not circulating coolant insure that the thermostat is not stuck closed. If the thermostat is ok then the pump will have to be replaced.
Check engine. Is radiator really full? Does the rad. fan come on? Is the fan belt on water pump tight? If these things are ok, you probably need a new thermostat.
can the gasket go bad behind the water pump houseing
had the same problem with a sibring,took to the garage,they replaced the thermostat and gasket and found a hairline crack in the thermostat housing they replaced the housing and everything was fine then
You might as well change the Thermostat because it is comparatively inexpensive, but test the water pump to see if it needs to be replaced.
Assuming it did not overheat before you replaced thermostat and water pump you may have installed the thermostat backwards. It is also possible the cooling system wasn't refilled properly and was air bound.
Could be thermostat not opening causing a back pressure
Water pump defective.
water pump