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Home >> Mazda >> 1990 >> 626 Base >> Repair and Diagnosis >> Engine Mechanical >> Engine Cooling Fan >> Component Testing >> THERMO Switches Test

THERMO Switches Test

  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.
    Fig 1: Locating Thermo Switch
    G90C09836Courtesy of MAZDA MOTORS CORP.
    Fig 2: Testing Thermo Switch
    G90E09837Courtesy of MAZDA MOTORS CORP.
  2. Check for continuity of No. 1 thermo switch. Switch is normally open. Continuity should not exist until temperature reaches more than 207°F (97°C).
  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).
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