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Coolant Temperature Switch (With A/T)

  1. Remove coolant temperature switch. Coolant temperature switch is located in engine coolant passage near cylinder head. To verify wire colors for proper identification, see appropriate wiring diagram in WIRING DIAGRAMS article.
    NOTE: Coolant temperature switch may be also identified using appropriate illustration in THEORY & OPERATION article.
  2. Place threaded end of coolant temperature switch and thermometer in container of water. Attach ohmmeter to switch electrical terminal. Heat water and ensure no continuity exists between switch electrical terminal and switch body when water temperature is less than 208°F (98°C).
  3. Check that continuity exists between switch electrical terminal and switch body when water temperature is greater than 221°F (105°C). Replace coolant temperature switch if defective.
NOTE: The EGR gas temperature sensor may be referred to as EGR function sensor.
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