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So I am the age old issue with defrost. My vents blow hot air just fine, but when I switch to defrost the flow is weak. I have heard a lot about issues with the flipper getting stuck, clogged or just plain unresponsive. I also looked for the requisite vacuum hose but did not see it. My truck has a crate 350 and all the smog equipment is gone, so I figure that is why. But I still have hot air. I am basically admitting total ignorance regarding air/comfort control systems, so if someone wants to explain it to me, that would be helpful.What would be even more helpful would be a diagram or pictures of the the flipper/door that I figure is at the heart of the problem. I won't be able to tackle this until Sunday, but I figure I will look at it then as I will be installing a new engine block heater and fill pipe for the passenger gas tank.
Make sure your HVAC reserve can on the firewall has manifold vacuum running to it.
Yes, please let us know if you have AC or not. If not, I can post a few pics of my heater box since it's off right now.If non AC, it's really a pretty simple unit.