I have been told two different things, head gaskit or blockage?
Basically water bubbles out when i'm pourng it and slightly reving it, it just gushes out,and heater go cold after 5 mins of driving.
I have changed two water pipes and the water header tank.
Please help me!!!

 

It is Could possibly be either the Head Gasket or an Air Pocket (Not a Blockage) sitting in the heater Matrix. A decent garage will be able to test the water tank and tell you if your Head gasket is gone because it will be pushing compression gas into the water system and they will be able to test for it.

2 Things though, Does the Radiator Fan come on at the right time and does the top and Bottom hoses from the Radiator get hot when the engine is up to temperature.

 

yup they both get hot and hard...but the temp doesnt rise...the car doesnt overheat