Dr4Film Posted December 21, 2019 Share Posted December 21, 2019 (edited) Back in October I posted a question on the old site about my Dash AC system when the proverbial problem hit my dash AC system where you lose control of the vents and all of the air comes from the defrost vents. There was a post from a member, Jim M. with a 2002 Knight that I saved to work on the problem later. Here is his post below. Quote I went through this a few months ago. Yes, the black rectangular box is the vacuum generator. I disconnected the hose from it to the reservoir and confirmed no vacuum from the generator. In my case—and likely yours—the vacuum generator is a venturi gizmo, as verified by an air pressure line going to it (I know; seems ironic). So the next thing to check would probably be air pressure to the vacuum generator. I ended up fixing mine by taking it apart and blowing out the venturi; it was plugged. But many folks replace them with vacuum pumps. Jim M. 2002 Monaco Knight 30PBD Jim M, or anyone else reading this post, I would love some more specific advice as to what to do as I now have the box and components removed from the firewall. Do I just use my compressor and blow air down through the venturi from the top? Is there anything else I need to do before reassembling it back to the firewall? If this doesn't solve the problem I will most likely purchase an electric vacuum generator to put in it's place. However I am very confused as to how THIS vacuum generator operates the air flow direction control when I don't see any vacuum hose going through the firewall into the dash area. Does anyone know how this all works because I don't! Thanks so much! Edited December 21, 2019 by Dr4Film Link to comment Share on other sites More sharing options...
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