Gentle men, we are assuming that the heater core is COMPLETELY clean. It may be partially blocked, and only part of the heater core is getting anything at all.
I know you have said that you have flushed the heater core, but have you back flushed it.
Alot of times the crud will not be displaced with regular direction pressure because the path of least resistance has already been created.
I suggest removing the firewal hoses since we know the hot coolant is reaching that point. Then use moderate pressure, feed both orifices with pressure and see if anything else evacuates.
If there is still a problem, then I would suggest your heater core is in need of a replacement.
I would not suggest this lightly as most core are a female dog to replace.
Sunday, January 6th, 2013 AT 4:03 PM