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THERMO-Time Switch: BMW

  1. Disconnect connector at thermo-time switch. Connect ohmmeter to terminal "G" and ground. Check for 40-70 ohms.
    NOTE: Terminal "W" on 528i thermo-time switch is connector terminal number 86c.
  2. Connect ohmmeter between terminal 85 ("W" on thermo-time switch) and ground. Connect terminal 86 with 30 ("G" on thermo-time switch). For temperatures above 59°F (15°C), you should have an infinity reading. Below 59°F (15°C), you should have a zero reading for 0 to 8 seconds.
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