Driver side Blend Door Actuator

I have been experiencing HVAC problems for some time, so I recently tried to do something about them. My truck is single passenger control, and the problem is the air flow only blows out the top vents. Nothing out of the defrost or floor vents.

Because of the 316,000 miles I have on this truck, I decided to purchase three new actuators for the Fresh/Recirc, cool/warm, and Blend door Mode on the driver's side and a new climate control module.

I have installed all three actuators plus the climate control module. The Fresh/Recirc and cool/heat [both on the passenger side] work fine. No problems.

The problem is the blend door actuator [Mode actuator?] On the driver's side. I actually purchased an AC-Delco OEM actuator for that side, but it hasn't solved the problem.

I assume I correctly installed it, although I wouldn't bet my life on it. I watched several videos about installing it and did my best to follow them, but it is a very tight fit.

Today, I pulled the problem actuator and tried to test it to ensure it worked. The result was startling. When I turned on the blower and tried to switch the mode on the panel, the actuator worked fine for two sweeps back and forth then it suddenly just stopped working!

I disconnected and reconnected the power to it at least four times but it never worked again.

So now I am left scratching my head. At this point I'm thinking it's an electrical problem because of the way it stopped working.

Where do I go from here? What seems to be the most likely cause and fix? Any help/direction would be greatly appreciated!

Dudley 'Gunner' Garidel
Baton Rouge, LA