mackrmodel686st Posted January 10, 2017 Share Posted January 10, 2017 I've got a 2001 cx613 Mack vision that doesn't switch between defrost, floor, dash and mix. I've replaced the controls but didn't fix the problem. I don't see any burnt or melted wiring. Can anyone point me in the right direction on how to fix this issue? Quote Link to comment Share on other sites More sharing options...
alex g Posted January 10, 2017 Share Posted January 10, 2017 Not sure but in my R model it has air cylinders that move duct work to change heat flow. Could be cylinders not moving properly or duct work unhooked or stiff. I had heat problem in my R it was the cylinder not moving ductSent from my SM-G386W using Tapatalk Quote Link to comment Share on other sites More sharing options...
mackrmodel686st Posted January 10, 2017 Author Share Posted January 10, 2017 The ch613's we have are the same way, but I think the cx613's are electric. Quote Link to comment Share on other sites More sharing options...
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