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Home >> Geo >> 1989 >> Spectrum 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Engine Cooling Fan >> Component Testing >> Coolant Temperature Fan Switch
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Coolant Temperature Fan Switch

  1. When coolant temperature fan switch is grounded, coolant fan relay is energized. When relay is energized, power is removed from coolant fan.
  2. When coolant temperature increases, coolant switch ground opens, de-energizing relay and activating fan motor. On all except Spectrum, coolant fan switch is located in thermostat housing on engine. On Spectrum, switch is located on radiator tank.
  3. To test switch, remove switch from vehicle. Using ohmmeter, ensure continuity is correct between wire connector and switch body (or 2 switch terminals on Metro and Spectrum). Switch may be gradually heated in water for testing. See COOLANT TEMPERATURE FAN SWITCH  table.
    COOLANT TEMPERATURE FAN SWITCH

    Application No Continuity °F (°C) Continuity °F (°C)
    Metro
    Thermostat "A" Above 208 (98) Below 199 (93)
    Thermostat "B" Above 215 (102) Below 206 (97)
    Prizm Above 194 (90) Below 181 (83)
    Spectrum 167-178 (75-81) 180-190 (82-88)
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