The Isuzu Trooper (98 – 02) electronic thermostat consists of the thermo sensor (1) and thermostat unit (4) which functions electrically to reduce the noises being generated while the system is in operation. The electronic thermo sensor (1) is mounted at the evaporator core (2) outlet and senses the temperature of the cool air from the evaporator (3).

isuzu trooper electronic thermostat schematic diagram

Temperature signals are input to the thermostat unit. This information is compared by the thermo unit and the results in output to operate the A/C Thermostat relay and turn the magnetic clutch “ON” or “OFF” to prevent evaporator freeze-up. A characteristic of the sensor is that the resistance decreases as the temperature increases and the resistance increases as the temperature decreases.

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