replaced waterpump on 2004 Buick Rainier

i replaced the water pump and thermostat but acts like the thermastat wont open runs hot but pulled thermostat and checked but is workin but still gets hot acts like its vapor locked heater wont get hot even

Asked by for the 2004 Buick Rainier
look for proper fan operation and full coolant level (no air in system)
1 more answer , 1 more comment
the engine may be leaking coolant in the oil. check oil if so bad engine. common problem with this engine. good luck -i'm on my third engine :)
The same thing happend to my RAINIER I had to get a new engine. But the ploblem is the thermostat is not working and it over heating. I don't know what to do I think is going to happen again.. help!!!!!!!!