Maintenance of electrical applicances
22-58
(5) The water temperature sensor
The water temperature sensor is a temperature indication for the engine cooling fluid, it is a kind of
resistance type sensor very close to the radiator surface. It is the indication for the temperature
damper heating capacity.
Fig. 6.7 The outline diagram for the water temperature sensor
(4) The evaporator temperature sensor
The evaporator temperature sensor is a kind of temperature sensing resistance type sensor, it is fixed
in the air at the evaporator air outgoing side through the case. It shall send to the air conditioning
control module through the evaporator air outgoing temperature information, so that the air
conditioning control module can determine the air temperature being blown out.
Fig. 6.8 The outline diagram for the evaporator temperature sensor
(5) The temperature servo motor
The temperature servo motor is the most important motor for the air conditioning temperature control.
Through adjusting the temperature servo motor, the cooling and hot air mixed degree may be
adjusted, it shall reach the aim of adjusting the outgoing air temperature. The temperature servo
motor is connected with the temperature damper with the gear, because this kind of connection, the
motor rotation angle and the damper rotating angle is a linear change, with high rotation accuracy.
The temperature damper is continuously control, in this way, it shall maintain the best temperature
damper opening angle according to the objective of the temperature damper and the current opening
angle. As the preset temperature is 18
o
C, the air mixed door is fixed at the very cold position, as the
preset temperature is 32
o
C, the air mixed door is fixed at the very hot position.
The fault inspection:
The fault state:
The exhausted air temperature has no
change.
The temperature servo motor is not working
normally.
Fig. 6.9 The temperature servo motor
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