Auto Repairing 2008-2009 Ford F-Super Duty Large Temperature Differences
ISSUE Some 2008-2009 vehicles F - Super Duty with a build date prior to 11/06/08 , and is equipped with DATC ( Dual Automatic Temperature Control ) may indicate a temperature difference side -to -side is greater than 15 degrees Fahrenheit ( 8.3 degrees Celsius ) . The temperature difference is less than 15 degrees Fahrenheit ( 8.3 degrees Celsius ) would be considered normal and no repair attempts should be made . Also , no need to replace the EATC or HVAC control head . If equipped with manual climate control , the vehicle may indicate periods where the cabin temperature can not be maintained with the control button . Some customers may also complain of heat can not be reduced without turning the control knob either to Cool / Blue range. ACTION Follow the Service Procedure steps to correct the condition. SERVICE PROCEDURE Check Actuator Activity : DATC system can be monitored by IDS PID ( $ 9910 and $ 9911 ) . System A / C manuals can be observed through the right side of the instrument panel with the door positioned to the bottom drawer . PID activity erratic or uncertain actuator seemingly hunting for the correct position for the condition should be replaced . See Workshop Manual , Section 412-01 , for removal and installation details . Ignition should go when replacing the actuator , the actuator before installation of energy in the HVAC case will cause the part to be mis - the correct position and orientation will be lost . Actuator operation may cause .
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