I have flushed the hoses heater core is not clogged. Both lines coming in are hot. Plus i also took off my dash and heater core is too hot to touch. I changed my thermostat. I have also took the actuator off under the passenger seat and manually opened the door and you can definitely tell a difference but still just air not hot. Is there another blend door i can prop open. Nothing i'm doing is working. Thanks in advance for your time. Probably important to note as well: blower is blowing in defrost mode no matter what i change it to. Only blows out of the top. 99 Ram 1500 5.2 2wd

 

sounds like you have a case of wild vents. its due to the vac lines leaking, check them at the firewall on the passenger side. look for a cracked or broken line, and make sure un used ones are capped.

 

Would that also cause it not to get hot?

 

http://www.heatertreater.net/

 

Not sure if it would cause it not to get hot. But the air only coming out the defrost vents is a vac leak try the passenger side vaccum line might have become brittle and snapped happened to mine after a heater core replacement thought I really screwed it up.