Heater Core Temperature Sensor Test

Dip the sensor in ice water, and measure the resistance. Then pour warm water on the sensor, and check for a change in resistance.

Compare the resistance reading between the No. 1 and No. 2 terminals of the heater core temperature sensor with the specifications shown in the following graph; the resistance should be within the specifications.

Fig 1: Checking Resistance Between Terminals Of Heater Core Temperature Sensor

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: Identifying Resistance And Temperature Graph

Courtesy of AMERICAN HONDA MOTOR CO., INC.