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FATC
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9. FATC SENSOR & ACTUATOR
A. EVAPORATER SENSOR
It is a temperature-sensing device, which is positioned at the coldest point of the evaporator
(as shown in the
fig below)
. The control unit switches OFF the compressor at a temperature when condensed water tends to
form ice on the fins of evaporator. Thus it maintains the evaporator temperature within a specified range.
LOCATION
It is mounted on Air intake / Evaporator housing assembly.
ON VEHICLE INSPECTION
(WITHOUT DISMAN-
TLING HVAC UNIT)
Since the thermistor is mounted inside HVAC unit to
conduct the above test HVAC unit has to be disman-
tled. Alternatively following test can be conducted
without dismantling the HVAC unit:
1. Switch OFF the HVAC unit and allow the
HVAC unit to come to ambient temperature.
2. Open the glow box & lowering Glove box lid.
3. Disconnect the Pigtail connections
4. Measure the resistance it should match to the
ambient temperature. Refer graph in Inspec-
tion topic.
As given in the graph above
(~ 5 Ohms or less for
ambient temperature of 25ºC and above)