mackrmodel686st

2001 Mack cx613 heater controls

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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?

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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 duct

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