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Only works on high. No medium or low. Dealer says change resistor, but doesn't know where to find it.

Any suggestions.

The motor appears to be accessible from the engine compartment.
 

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I'm assuming its the diesel cause no one in their right mind would by a 450 without a diesel.



Its number 3. It appears to be on the HVAC box under the hood. Should be super easy to get to as it only calls for .3 to replace. Buy a new one and then you'll know what to look for. The dealers diagnosis is accurate.
 
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