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Preparation For Functional Test

WARNING: This page is about a different car, the 1999 Mercedes-Benz C230. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check fuses No. 4, 7 and 8.
  2. With ignition on, check in-vehicle temperature sensor ventilation fan by placing a small piece of paper over fan vent grille. Vent grille is located near dome light. See Figure. If sufficient ventilation is present, paper will remain on vent grille. If not, check ventilation fan voltage supply. See WIRING DIAGRAMS .
  3. Run engine at normal operating temperature for entire test. Put shift lever in "P" and set parking brake.
  4. Ensure outside air temperature is greater than 58°F (15°C).
  5. Manually open center and side air outlets.
  6. Ensure EC button indicator light is NOT on.
  7. Ensure recirculation button is not depressed.
  8. Set blower switch to position No. 3.
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