Trooper LS V6-3.5L (1998)
Evaporator Temperature Sensor / Switch: Description and Operation
ELECTRONIC THERMOSTAT
The thermostat consists of the thermo sensor (2) and thermostat unit (4) which functions electrically to reduce the noises being generated while the
system is in operation.
The electronic thermo sensor (2) is mounted at the evaporator core (1) outlet and senses the temperature of the cool air from the evaporator (3).
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.
A/C Thermo Switch / Sensor
If the air conditioning compressor's temperature rises above normal conditions, the A/C Thermo switch will open, disengaging the A/C compressor
clutch. The A/C Thermo switch will close and power will be reapplied to the clutch when the temperature falls.
ELECTRONIC THERMOSTAT UNIT
The electronic thermostat unit senses the temperature of the cool air from the evaporator and the evaporator fins by means of the evaporator thermo
sensor. This input determines whether ground is to be provided to the A/C thermostat relay. When the temperature becomes too low, ground is not
provided.
