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THERMO Switches

  1. Turn ignition to OFF position. Remove thermo switches from thermostat housing. See Fig 1 . Suspend switch in container filled with water and heat. See Fig 2 . Connect ohmmeter between terminal connector and switch base.
  2. Check for continuity of No. 1 thermo switch. Switch is normally closed. Continuity should exist at less than 207°F (97°C) and then circuit should open.
  3. Check for continuity of No. 2 thermo switch. Switch is normally open. Continuity should not exist until temperature reaches more than 207°F (97°C).
Fig 1: Locating Thermo Switches
G90C09836Courtesy of MAZDA MOTORS CORP.
Fig 2: Testing Thermo & Radiator Switch Continuity
G90E09837Courtesy of MAZDA MOTORS CORP.
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