Re: Temparture Blend Door Stuck?
I just pulled the heater core box, 2 weeks ago, on my sons 72 skylark. It was full of mouse nest that they built from rear seat batting material. They also chewed some of the squirrel cage fan fins off. The box was so nasty, I had to sand blast the whole thing inside and out. My guess is that there is a foreign object blocking the door, or it is rusted in place. You can try putting a little lube on the upper part of the door hinge shaft to see if it will free up, but I really doubt it. I wish they would have designed a cover plate on the cabin side that would have been removable. Note: the blend door by design should swing freely. As designed, there is nothing inside the box to interfere with the door. The door has a thin foam coating to act as a seal, but that is it.
1970 Chevelle Malibu (been my baby since junior year of high school 1989)
1968 Mustang 289 coupe (my wife's baby!)
1972 Skylark 350, converting to 455. (My sons first car)