just rebuilt my 93 wrx engine & dropperd it in & plumbed it all in ,it starts & runs fine .....i bled the cooling system but there's no heat comming from the heater the heater hoses to & from matrix are hot...if it's an air lock what's the best way to shift it ,or could it be the heater contol it's self (i did take it apart a while ago )

many thanks marv

 

Marv,
If the feed and return pipes for the heater are hot - the problem is with the heater unit itself.