Tomtom2012

I have just brought a 1995 wrx sti and checked the coolant the other day and just a crappy rust colour and temp was all over the place so did a coolant change today ( a night mate) I could not get the rad to bleed after 3ltr would not take any more so ended up tacking the top pipe of to the rad and filling that way all it is the car has only had around 5ltr and will not take any more car keeps temp now at just under half is this normal
Thanks

chrisl25lnf

Half way and under is fine

Tomtom2012

Am I right in saying if there was not enough would over heat as alway thinking not put enough in