Need heat help...flapper boxes not the cause, How does the heat get in?!? Options

[biosurfer1]

Since I have had my car, the defrost has been on constantly. During the winter, its a welcome "problem" but now its getting too hot around here for this.

I read up on the heating system and think I got the jist of it, and know mine is not working correctly. First off, I wanted to get the heat to stop from pouring into the cab.

I thought the flapper boxes were the only way for heat to get to the defrost, but after taking off both of them, they both work fine and are closed 100% of the time since the lever control wire is too lose (I'll fix that later).

The point is if the flapper boxes are closed, how there heat coming into the cab all the time??

Also, does the lever for early cars (mine is a '72) ground the blower motor? Mine was missing the fuse for the first couple months, and once I put it in, it ran anytime the iginition was turned on. I took out the fuse because I was trying to listen to the fuel pump, but once I put the fuse back in, the blower is not turning on. I do not remember what position the lever was in when the blower motor was working because I did not know it grounded the blower (if it does).

Next question I have is are the flapper boxes the same for both sides of the car, just mounted opposite of each other? I got the one on the drivers side off no problem, but on the passenger side, the bolts face up towards the engine and are a pain to get to! I knew it worked ok by taking off one of the hoses and feeling with my finger while opening and closing it.

Thanks guys!