Rodeo S 2WD L4-2.2L (1999)
Evaporator Temperature Sensor / Switch: Description and Operation
ELECTRONIC THERMOSTAT
The thermostat consists of the thermo sensor (3) and thermostat unit (5) which functions electrically to reduce the noises being generated while the
system is in operation.
The electronic thermo sensor (3) is mounted at the evaporator core (2) outlet and senses the temperature of the cool air from the evaporator (4).
Temperature signals are input to the thermostat unit. This information is compared by the thermo unit and results in the 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.
The electronic thermostat senses the temperature of cool air from the evaporator by means of the evaporator temperature sensor. This information
determines whether the thermostat will provide ground to the thermo switch relay. When the temperature becomes too low, ground is not provided.
OFF: Below 3.5 ± 0.5° C (38.3 ± 0.9° F)
ON: Above 5.0 ± 0.5° C (41.0 ± 0.9° F)
