right a couple of days ago on the way to work my car began to overheat it went over 100 and in to the red so i pulled over to check it the water tank was all bubbling up and the water pipes were all expanded and just seemed like there was loads of pressure in the system so i let it cool down and took it home later that day i drove it and the temp was all over the place up and down dropping from 100 to nothing back up again just random really the fans are kicking in so they are working ive checked the oil and water for any mixture as that would be a sign off the head gasket but they are fine i removed the thermostat to let it just run cool but still no different but if i leave the water cap loose it dont over heat as much but the water just evaporates after so long where its getting hot but this does seem to release some pressure i cant think what it would be ?? would this be anything to do with the water pump as i think it sounds a little funny it is a new pump on there about 6000 miles ago but it seems to sound a little like it did before it went last time ?
is there any way to check the head gasket or the water pump?
or just any ideas pleeese ???