Originally Posted by revo2k11
i dont have ac. do i still have a blend door?
Yes you do. The term 'blend door' usually refers to the door that controls the hot/cold mix via the temp dial on the HVAC panel. It is often positioned by an electric motor but some Rangers had a cable arrangement instead. The door can be fully open, fully closed or any place in between depending on the dial position.
There are 3 other doors that are controlled by vacuum servos and are either open or shut in normal operation. These control the airflow path through the system selecting a combination of fresh/recirculate, floor/panel and panel/defrost. When vacuum is insufficient to operate the system, the default path is through the defroster registers.