Blend Door Stuck on cold air

[VandyJ]

I have a 1999 chevy silverado 2500hd with a 6.0

 

The air was stuck on cold so I looked at the actuator and it is working properly. Both hoses in the engine bay are hot. I took off the actuator and tried moving the blend door and it is stuck. Any way to free the blend door so it will open with the actuator?

[Plugger49]

I had a similar problem last week. I was driving along on a hot day with the A.C. blasting away,when for NO apparent reason,the truck started blowing serious heat. I touched nothing previously to this. I shut it off to do a fifteen minute errand. Started it up,and it blew ice cubes again. I've been since told that the door can stick sometimes. I got at the door and sprayed the hinges hoping it'll help. The mechanic I ran this by said to switch from heat to A.C. now and then,twelve months a year. I guess it makes sense. When you get at that door spray it and move it (system off), back and forth. I used Fluid Film, it lasts AND stops corrosion.