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Defrost is the default position. Most likely a vacuum leak somewhere between the engine compartment and the passenger compartment. Look for a small black hose going through firewall ti the heater box inside. It should have vacuum from the engine on it. if not it's on the engine side. if it does it's probably in the passenger compartment. just trace the line back looking for the leak.

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Q: Why won't dodge ram 1500 heatAC shift between defrost and panel mode?
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