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4. If resistance is not as specified, check wiring harness between temperature sensor and control unit. Repair as necessary. If wiring harness is okay, replace icing protection temperature sensor. ICING PROTECTION TEMPERATURE SENSOR RESISTANCE Activation Voltage Temperature 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. 2 and negative lead to 2. Turn ignition on. Turn temperature control knob to Blue range detent. Voltage should be more than 2.0 volts. Turn temperature control knob from Blue range detent to Red range detent. Voltage should be more 3. If voltage is as specified, go to next step. If voltage is not as specified, check recirculated air switch circuits. See WIRING DIAGRAMS . Repair as necessary. If circuits are okay, replace recirculated air 4. Connect voltmeter positive lead to socket box terminal No. 5 and negative lead to terminal No. 9. Turn ignition on. Turn temperature control knob to Blue range detent. Voltage should be more than 3.0 volts. 5. If voltage is not as specified, check recirculated air switch circuits. See WIRING DIAGRAMS . Repair as necessary. If circuits are okay, replace recirculated air switch. Blend Air Flap Actuator Motor 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 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- 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 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. 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 Sensor Temperature - °F (°C) Ohms 43 (6) 3600 59 (15) 2300 72 (22) 1700 77 (25) 1500
2001 Mercedes-Benz ML320 2000-01 MANUAL A/C-HEATER SYSTEMS ML 320, ML 430 & ML 55
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