Help - Heating problems

Hi all,
 
Hope someone can help me. The heat coming out of my vents is only luke warm at best, whatever setting I have the climate control on...
 
I've changed the main radiator, water pump, heater matrix, thermostats, blower motor and flushed the system a couple of times!!!!
 
Anything I've missed???
 
Thanks
 
Gez

Heater core?  Pray it isn't that

That's about all that's left unfortunately.

wut is the differnece between the heater core and heater matrix? you might have some bubbles in the system, just let the car idle with the rad cap off for a while. 

I think the heater matrix is the U.K. name for the heater core, I know they had to remove the dash to fit the new one. Got to take it back to the garage tomorrow, they hoping its an air lock.... so am I.

Do you have any coolant leaks?  Heater fan working?  Isn't there a heater valve?-  maybe that's not working?

It was an air lock, everythings fine now, alomst too hot... Seen the old heater core - what a mess totally rusted up.

Air lock - what's that?  Is it the term for a valve being stuck closed due to bubbles?  Sorry if this sounds dumb - I've never heard the term before.

Yeah thats it - difference between U.K. and U.S terms

Thank you:)