I have a 99 K1500 Suburban with front and rear heat/air, the front heat is cooler than the rear.
I have replaced the actuator and no change, while the actuator was off I rotated the piece the actuator controls and the heat was great, but when the actuator is installed it's cooler than the rear
I have replaced the actuator and no change, while the actuator was off I rotated the piece the actuator controls and the heat was great, but when the actuator is installed it's cooler than the rear