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Blend Door Calibration

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Old 11-24-2010, 12:00 PM
Terry Donlan Terry Donlan is offline
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Join Date: Nov 2010
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Default Blend Door Calibration

I have a 2005 Grand Caravan that has the 3 zone Heat/AC unit. Every season I have to have my Blend Doors recalibrated because it won't allow me to redirect where the air is blowing. Does anyone know the procedure to recalibrate the blend doors? I have to go to the dealer twice a year to have this done and they charge me $100 each time. I'm sure it's easy to do, I just need to know how?
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Old 11-24-2010, 02:22 PM
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Tizzy1 Tizzy1 is offline
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Posts: 2,924


The A/C-heater control module must be recalibrated each time an actuator motor or the A/C-heater control is replaced. If the vehicle is so equipped, the calibration procedure also includes rear HVAC positions for each actuator motor.
  1. Turn the ignition switch to the On position.
  2. If equipped with the manual temperature control (MTC) system, press and hold the Rear Wipe/Wash and Recirculation buttons for at least five seconds. If equipped with the automatic temperature control (ATC) systen, simultaneously press and hold the Power and Recirculation buttons on the A/C-heater control for at least five seconds. The MTC A/C-heater control Rear Wipe/Wash button light emitting diode (LED) and Recirculation button LED, or the ATC A/C-heater control Delay and Recirculation graphics will begin to flash when the calibration procedure has begun.
  3. The calibration procedure should take less than two minutes to complete for the manual A/C-heater control, and less than twenty seconds for the ATC A/C-heater control. When the LEDs or graphics stop flashing, the calibration procedure is complete.
  4. If the LEDs or graphics continue to flash beyond the two minute (manual) or twenty second (ATC) calibration time, it indicates that the A/C-heater control has detected a failure and a Diagnostic Trouble Code (DTC) has been set. Refer to Body Diagnostic Procedures to perform further diagnosis. The LEDs or graphics will continue to flash even after the ignition switch is cycled Off and On, until a successful calibration is completed or until the vehicle has been driven about 13 kilometers (8 miles).
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Old 11-29-2010, 10:17 AM
Terry Donlan Terry Donlan is offline
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Join Date: Nov 2010
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Default Blend doors

This is exactly what I was looking for, thank you. The problem is it didn't fix the problem this time. The funny thing is my battery died this weekend and after I replaced the battery the blend doors started working again.
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Old 11-29-2010, 10:17 AM

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