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17-62 ELECTRICAL SYSTEM Switches and Sensors Brake Light Switch Inspection • Refer to the Brake Light Switch Inspection in the Periodic Radiator Fan Switch Inspection • Remove the radiator fan switch (see Radiator Fan Switch • Suspend the fan switch [A] in a container of coolant so that • Suspend an accurate thermometer [B] in the coolant, so NOTE ○ The switch and thermometer must not touch the con- • Place the container over a source of heat and gradu- • Using the hand tester, measure the internal resistance Special Tool - Hand Tester: 57001-1394 If the hand tester does not show the specified values, re- Radiator Fan Switch Resistance Rising Temperature: From OFF to ON at 86 ∼ 90°C (187 ∼ 194°F) Falling Temperature: From ON to OFF at 81 ∼ 85°C (178 ∼ 185°F) ON: Less than 0.5 Ω |