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FATC
21
12. FATC SENSORS AND ACTUATORS
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.
PIN OUT
PIN DETAILS
PIN NO
DESCRIPTION
01
Temperature out to control panel
02
Ground
LOCATION:
It is mounted on Air intake / Evaporator housing assembly.
B. ON VEHICLE INSPECTION (WITHOUT DIS-
MANTLING HVAC UNIT)
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 connection.
4. Measure the resistance it should match to the
ambient temperature. Refer graph in Inspection
topic.
As given in the graph above
(~ 5 Ohms or less for
ambient temperature of 25ºC and above)