Chevrolet Repair: Overheating, heater hoses, radiator fan

Question
i,ve changed the thermostat,water pump,guage sensor and also had a high pressure rad flush. it was fine for one day,now it is blowing cold air again.theres alot of pressure build up making the fluid shoot out the overflow hose.could the heater core be no good or blocked up again?

please help  

Answer
What I would do is try this, remove the thermostat, and reinstall without the thermostat. It will take a while to get warm air in the vehicle but if this stops the overheating, then this will be the problem. Also, its alot easy to flush the heater core by removing the heater hoses, and flushing it this way. Sometimes, you dont get everything out of the dirty cooling system. Another thing to check is make sure your radiator fan is coming on, once the vehicle is warmed up. If the fan doesnt come on, then you either have a fuse blown, or a bad relay. Hope this helps,, and thanks..