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Home >> Mercedes Benz >> 1998 >> C43 >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Manual A/C-Heater Systems - Ml 320, Ml 430 & Ml 55) >> System Tests >> Functional Test Preparation

Functional Test Preparation

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. Check condition of fuses F16, F41, F43 and F44. See WIRING DIAGRAMS  . Repair and/or replace fuses and necessary.
  2. Turn ignition on. Locate in-vehicle temperature sensor aspirator blower vent grille above anti-theft indicator light. Place a half-inch square of tissue paper over aspirator blower vent grille. If paper stays on vent grille, go to next step. If paper does not stay on vent grille, correct insufficient aspirator blower ventilation.
  3. Put shift lever in "P" and engage parking brake. Run engine at idle until it reaches normal operating temperature, about 176°F (80°C). Ensure ambient (outside) temperature is greater than 58°F (15°C).
  4. Manually open center and side air outlets. Ensure recirculation button is not depressed. Set blower speed knob to position No. 1.
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