My battery was getting really weak so I figured I'd replace it before I got stranded . I didn't have a memory saver at the house but didn't think I needed one. I replaced battery without an issue, but now my ac only blows cold on te lowest setting , if you go one click to the warmer side it goes full heat. I understand after battery is disconnected ,the actuators will " reset" themselves when battery is reconnected. So the only thing I can figure is my actuator is bad in that it won't re synchronize ? If I had memory saver I mighta avoided all this .......
Any input greatly appreciated

 

You can try the relearn, where you turn the temp dial all the way to the right, the fan speed all the way to the right and the last know all the way to the left and press and hold the outer buttons until they start flashing. Don't adjust anything until they stop blinking. That may work for you, but some have found that if you add a resistor in series to a wire on the back of the control unit, you will no longer have the issue. I'll see if I can dig up the instructions...

 

Try this:
https://www.hummerforums.com/forum/h...e4/#post287052

 

Thanks
I will give that a shot

 

Tried the reset...... Still goes full heat if you go 1 to 2 clicks off full cold....