my heater blows lukewarm, I think its a vent door problem. I changed the thermostat and the engine temperature is good and properly flowing through the heater core. I think its drawing in outside air and mixing with the heated air. Any suggestions on how to fix this. 96 Ranger xlt.

 

on my 98 it was the blend door it was cracked my friend and i tore apart the dashboard a replaced it

 

Either the blend door actuator or the blend door itself, usually it's the actuator........I just had to do the same to my towpig, was only gettin luke warm air, change the acuator & fixed.

Base PN# 19E616 for actuator.........