Heater core/blend door question

Currently the heater core is not hooked up in my Dart. I just have the hose looped back to the intake. I want to hook it up, but my bypass/cutoff valve was rusted out, so I pitched it. Can I hook the core up without the valve, or will heat constantly be getting into my cabin (I.E. the blend door never completely closes)? I know a lot of earlier cars didn't have it, and even today some cars don't have a cutoff valve. Was it only there because my car originally had A/C?

Nodody?????

Superdart
I have a 67 Notchback w/o the valve, no A/C, and a 69 Fastback With the valve, and fac A/C.
It shoudn't make any differance if you hitch it up w/o the valve, but if your heater door is not closed you are right, you will get constant heat out the door. won't hurt anthing but will keep you warm lol.
You can probably get a valve at a J Y or an a parts store.

The doors are not hard to adjust, just hard to get at the back of the control. sounds like the cable housing has slipped in the braket that holds it. Best way to get at the cables is to remove the radio and stuff in that area. Also leave the controls hitched up and pull out to work on them. the housings are held by a little clamp and a phillips screw. loosen the screw and move the cable one way or the other. You want about 1/4 in hanging out as a rule.
Stubby and offset scerew drivers are the tools her, along with sraight and bent needle nose plyers.
Hope this helps.

Dave C.

I figured as much about the valve. My thought is that it is mostly there to keep the heater from fighting the A/C in the summer (since they are technically in the same spot). Otherwise the blend door should be sufficient.

Thanks.