BMW Coupes and Sedans 1970-1988 Repair Guide

Thermo-Time Switch

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TESTING



  1. Remove the wire terminal from the thermo-time switch.
  2.  
  3. Connect a test lamp to a positive terminal and the W terminal of the thermo-time switch.
  4.  
  5. The lamp should light at coolant temperature below 95°F (35°C).
  6.  
  7. Leave the test lamp attached to the W terminal and connect a positive jumper wire to terminal G .
  8.  
  9. The internal bi-metal control should open after a short time and the light should then go out. If not, replace the thermo-time switch.
  10.  

 
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