I have a 89 Cherokee two door 4.0 inline six. Put new thermostat heater core and cleaned out all heater vents but my jeep still won't heat up enough to blow hot air Any ideas on how to fix this problem

 

how hot are the hoses going to the heater core getting? it may be an issue behind the dash if they are really hot.
check them first.

 

Didn't think of that ill check them tomorrow when i start jeep to go to work then ill get back to let y'all know if it is or not