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You could have a stuck thermostat or your cooling fans aren't working.
thermostat is more than likely stuck shut from the overheat. Have to be changed.
Cooling system low on fluid Cooling system air lock Radiator fan not working Thermostat failiure Head gasket blown Cylinder head cracked Block cracked. Most garages can run a couple of tests to determine which of the above is causing the car to overheat.
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.
Without make model year & engine size.... Head gasket, waterpump, hoses, radiator, cooling fans not coming on belt to waterpump, thermostat, etc...
The sensor on the thermostat housing is a cooling fan switch. Cooling fan switch closes the circuit to engage the cooling fan(s) when the optimum temperature is reached. When not replaced, cooling system fans will either remain continually "on" or not function causing the engine to overheat, internal engine damage and/or temperature light illumination.
water pump or cooling fans or thermostat low coolant
A 1991 Subaru Impreza might overheat because of a leaking cooling system or because of a damaged thermostat. You might also have a damaged or leaking radiator or a cooling fan that is not working.
Type your answer here... IF WE CHANGED ONLY COOLING FAN THEN IT WILL BE OVERHEAT BECAUSE WE DON'T CHANGE OR FLUSHING OF RADIATOR. WE CAN REMOVE THERMOSTAT VALVE ALSO MAY BE HOSE PIPE WILL BE BEND
Thermostats determine when antifreeze enters the main cooling system. If the thermostat isn't working correctly, the antifreeze could enter the engine to late, (or not at all) resulting in an over heating engine. Another problem of having antifreeze enter the engine late, is that if your engine is very hot, possibly a little warmer than common, when the antifreeze enters the engine, the cold fluid could cause the engine block to cool down quickly, causing a cracked engine block.
It might be a cooling problem such as the thermostat. I think you should get the cooling system checked. Something is causing it to overheat.
Blocked radiator, low on coolant, stuck thermostat, air in cooling system