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Home >> Mercedes Benz >> 1999 >> C43 >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Manual A/C-Heater Systems - Ml 320, Ml 430 & Ml 55) >> System Tests >> Electrical Tests >> Blend Air Flap Actuator Motor

Blend Air Flap Actuator Motor

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Mercedes-Benz ML55, 2001 Mercedes-Benz ML430, 2001 Mercedes-Benz ML320, 2000 Mercedes-Benz ML55, and 2000 Mercedes-Benz ML430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect socket box to A/C push button control unit and wiring harness. See CONNECTING TEST EQUIPMENT  . Connect voltmeter positive lead to socket box terminal No. 1 and negative lead to terminal No. 9.
  2. Turn ignition on. Turn temperature control knob to Blue range detent. Voltage should be less than one volt. Turn temperature control knob from Blue range detent to Red range detent. Voltage should be 11.0-14.0 volts.
  3. If voltage is as specified, go to next step. If voltage is not as specified, check blend air flap actuator motor wiring harness circuits. See WIRING DIAGRAMS  . Repair as necessary. If circuits are okay, replace blend air flap actuator motor.
  4. Connect voltmeter positive lead to socket box terminal No. 8 and negative lead to terminal No. 9. Turn ignition on. Turn temperature control knob to Red range detent. Voltage should be less than one volt. Turn temperature control knob from Red range detent to Blue range detent. Voltage should be 11.0-14.0 volts.
  5. If voltage is as specified, go to next step. If voltage is not as specified, check blend air flap actuator motor wiring harness circuits. See WIRING DIAGRAMS  . Repair as necessary. If circuits are okay, replace blend air flap actuator motor.
  6. Turn ignition off. Disconnect test cable from A/C push button control unit. Connect ohmmeter positive lead to socket box terminal No. 1 and negative lead to terminal No. 8. Resistance should be 120 ohms.
  7. If resistance is not as specified, check blend air flap actuator motor circuits. See WIRING DIAGRAMS  . Repair as necessary. If circuits are okay, replace blend air flap actuator motor.
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