Originally Posted by
HeavyChevy3800
The HVAC doors are vacuum actuated. There is a vacuum line that runs off of the intake back through the firewall and up under the dash. When that vacuum line breaks the HVAC defaults to defrost. There should be a vacuum diagram under the dash that will show you which line controls the HVAC. Usually that line is either working or broke and not intermittent. It's something worth checking though.
Alright, first thing I'll look at later today when it cools down. Thanks for the direction. I suppose its possible its not broken, but is getting a shitty seal for some reason?
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