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It is common for a mode door actuator to cause this problem. I have also seen the mode door break in the housing, so replacing just the actuator will not always work. You need to verify the problem.
acuator mode door
WARNING: Disable the airbag system before attempting any steering wheel, steering column or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable. Wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to follow these instructions may result in possible serious or fatal injury.
NOTE: The heating-A/C system is equipped with two mode door actuators, one for the panel/floor-air door and one for the defrost-air door.
NOTE: Illustrations shown with instrument panel removed for clarity.
PANEL/FLOOR DOOR ACTUATOR
Fig 11: Securing Panel/Floor Door Actuator
Courtesy of CHRYSLER LLCView Full-Screen
DEFROST DOOR ACTUATOR
Fig 12: Securing Defrost Door Actuator
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Not a fuse. The hvac control module controls the mode actuator.
Disconnect both battery cables (positive and negative) and hold them together for 15 minutes. Then reconnect one at a time, positive first then negative. This should reset the system.
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