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Found the fitting and got the vacuum line connected. The push buttons on the hvac unit are working now but the heat selector lever still won't slide. Doesn't seem like this would use vacuum though. Guessing the linkage might be corroded. I'll have to look into it a bit more. Thanks again for...

Thanks a lot guys! My heater controls aren't working so that's probably what the vacuum line is for.

Great! Thank you guys. I'll look tonight for that tee on the intake manifold. Any idea what the vacuum line is for?

Hi all, Hoping someone can direct me where to route this vacuum line. From what I can tell it goes to the hvac area under the dash. The end under the hood is just hanging there. Thanks, Matt '68 Newport