HARRIER BOOK 1_09-07-2019

FATC

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)