TIAGO

HVAC

10.1.5.5. THERMISTOR OR THERMO SENSOR

It is a temperature sensing device, which is posi-

tioned at the coldest point of the evaporator

(as

shown in the fig below)

. The control unit switches

OFF the compressor at a temperature when con-

densed water tends to form ice on the fins of

evaporator. Thus it maintains the evaporator tem-

perature within a specified range.

LOCATION

It is mounted on Air intake / Evaporator housing assy

PIN OUT

PIN DETAILS

PIN NO DESCRIPTION

Temperature out to control panel

Ground

NOTE



Refer Thermistor / Thermo sensor removal and

installation process

from On Vehicle repairs.

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 connection.

4. Measure the resistance it should match to the

ambient temperature. Refer graph in Inspection

topic.

5. As given in the graph above

(~ 5 Ohms or less for

ambient temperature of 25ºC and above).