What is your question?
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What is your question?
There is a port up top and another lower in the line. Which one do i use ? Does it matter which one i use ?

Ok Thank you. The reason i asked is because im not getting any air hot or cold through the ports! Im getting some airflow through the defrost ports at the bottom of the windshield but nothing through the ports near the radio or the right or left side of the dashboard. Any idea what that could be ??
A vacuum leak under hood! Most likely on the passenger side firewall.... It will be a 'very small' hose or plastic tubing that's broken or unhooked... Look.... It's there somewhere!
You really know your business. I looked carefully and found that the vacuum hose was broken at the tee connector. I cut off the broken piece , reconnected the hose and it's working perfectly now. I can't thank you enough..!!! Sincerely , Steve
Cool!!... I've been doing this for longer than I care to mention!!!.... Glad you got it fixed....