my heat wont blow hot, i changed my therm and i blewout my heater core lines but the air is still blowing cool, please help

 

hows the water level?

 

the water level is fine, temp is in the middle, control **** is not broken works file the blend door is working, no leaks at all, but my a/c is not pluged up i dont know if that has anything to do with the heat problems that i am having, i also have high miles on the truck.

 

is there any heater control valve for this v6 engine? or is there any line that i can check for vaccum leaks that may be causing this problem?