have problem with heater blowing cold flushed it through put new thermostate in any suggestions its a 300 seris its doing my head in lol

 

So, Not sure what you are refering to as a 300 series.
Have you bleed your coolant system?

 

its a2.5 deisel i have bleed system took top pipe off from matrix but its not coming out very fast could it be controls inside the vechile or do think it could be blocked but it was working i had a split water bottle replaced that just at a lose as the car not over heating and getting up to temperature thanx