Massey Ferguson AC20 – Air Conditioning Control Module: Motor for right-hand heating shutter motor output error

An electrical output error or failure associated with the actuator motor (X450) that controls the right-hand heating shutter/flap in the climate control system.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• MF 7600 Series
• 7617
• MF 8600 Series
• 8650
• 8670
• 8690
• MF 5400 Series
• MF 6400 Series

1. 1

   Inspect the X450 motor wiring harness for chafing, breaks, or short circuits

2. 2

   Check the Air Conditioning Control Module connections (specifically the blue X439 and yellow X440 connectors) for loose pins or corrosion

3. 3

   Test the X450 motor for proper resistance and verify it receives voltage from the control module when the climate control temperature is adjusted

4. 4

   Inspect the physical right-hand heating shutter/flap door for mechanical binding or debris, which can cause an overcurrent output error at the motor

1. 1

   Turn off the tractor ignition and disconnect the battery to prevent electrical shorts.

2. 2

   Access the HVAC distribution box (typically located in the cab roof on these series, as indicated by the associated roof harness earth X455).

3. 3

   Locate the right-hand heating shutter motor (Component X450) on the side of the heater box.

4. 4

   Disconnect the electrical harness connector from the X450 motor.

5. 5

   Remove the mounting screws securing the actuator motor to the HVAC housing.

6. 6

   Remove the motor and manually actuate the heating shutter door to ensure it moves freely without binding.

7. 7

   Align the shaft of the new shutter motor with the flap receptacle and secure it with the mounting screws.

8. 8

   Reconnect the electrical harness to the motor.

9. 9

   Reassemble the cab roof/HVAC access panels.

10. 10

    Reconnect the battery, turn on the tractor, and cycle the climate control system to verify the AC20 code clears and the right-hand heating shutter operates correctly.