1992 325i Cabin heater nominal at best

[crossworks]

Recently changed out a leaking thermostat housing in my 92 325i. Did what I thought was a thorough job of filling and bleeding the cooling system. When the heater is turned on and the engine is good and warmed up the air coming out of the vents is barely warm. Im trying to figure out if I missed something in the process of bleeding the system and I still have air in the heater core and therefore no cooling or if this could some how be an electronic issue.