Radiator Fan Switch

Remove the radiator fan switch A from the water passage, radiator fan switch "B" from the cylinder head and radiator fan switch "C" from the radiator. See REMOVAL AND INSTALLATION .
Suspend each radiator fan switch in a container of water. See Fig 1 . Heat the water and check the temperature with a thermometer. Do not let the thermometer touch the bottom of the hot container.
Measure the continuity between the terminal "A" and terminal "B" and compare to specifications in RADIATOR FAN SWITCH CONTINUITY SPECIFICATIONS .

RADIATOR FAN SWITCH CONTINUITY SPECIFICATIONS

Application

Temperature - °F (°C)

Switch A

⁽¹⁾ 196-203 (91-95)

Switch B

⁽²⁾ 212-226 (100-108)

Switch C

⁽²⁾ 205-216 (96-102)

⁽¹⁾	Switch opens when temperature drops to 5-15°F (3-8°C) less than continuity temperature.

⁽²⁾	Switch opens when temperature drops to 5-23°F (3-13°C) less than continuity temperature.

Fig 1: Testing Radiator Fan Switch

Courtesy of AMERICAN HONDA MOTOR CO., INC.