Isuzu 1999 RODEO Workshop Manual page 59

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–31
The evaporator core with a laminate louver fin is a
single-sided tank type where only one tank is provided
under the core.
874RX002
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
874RX005
evaporator core (2) outlet and senses the surface
temperature of the evaporator core (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.