I decided to change my thermostat, (all tho I now wish I took this advice, If it aint broke, don't fix it)
Drained all coolant out put new thermostat in, filled it back up with coolant, and now if my car is stood still with engine running with heater on the temp gauge drops down slowly, if i start driving again it goes back up to half way, and heater is not very good at all.
Yes I know am idiot for not following advice if it aint broke dont fix it.
Hindsight is a wonderful thing.
How can I sort it.
There are 2 pipes that go to heater matrix, 1 inlet and 1 outlet, the inlet seems to be getting hot but outlet not very warm at all, I don't really want to take matrix out, as that is a very big job, and I need my car for work, so don't want to take dash out.