A/C Blend/Mode door issue

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85 c10--having issue with A/C blend door. Door #1 appears to be working fine through various modes(ie. heat, bi-level, vent, defrost,etc.) however when I turn to Norm or Max a/c door number 1 goes to the correct position however door #2, which is connected to door #1 via a threaded rod on top of heater box, does not open entirely. This is causing weak air flow to vents. I am able to move door#2 into place and air flow is fine. Any suggestions on how to fix this issue. Door #2 has a rod that goes through it and I am able to move the door independent of the rod which I don't think I should be able to do. This could be causing the issue since door 2 should move into place once door #1 opens all the way. Picture attached

Any suggestions??

2nd question--should there be a noticeable difference in air flow from Norm a/c to Max?

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Also noticed that door #1 is not going fully into place when a/c mode selected....still has ~1/4" gap of space that I can push to closed.

 

[AuroraGirl]

Sounds like a vacuum leak

 

[Snoots]

Door #2 has a rod that goes through it and I am able to move the door independent of the rod which I don't think I should be able to do. This could be causing the issue since door 2 should move into place once door #1 opens all the way.

1.) That is correct. That door #2 should move into place. Check for anything blocking it, give the hinges a drop of machine oil and make sure the rod is not bent or blocked.

2.) Yes there should there be a noticeable difference in air flow from Norm a/c to Max.
Norm is for cooling outside air, Max recirculates interior air.

 

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Door #1 is opening and closing — would it do that with a vacuum leak?


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