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HD
Heater Fan Switch Test
Check for continuity between the terminals in each
switch position according to the table.
y
T e r m i n a l
1
2
3
4
5
6
P o s i t i o n
\
1
2
3
4
5
6
OFF
1
O - - o -
- O
2
O -
2
O -
3
o -
r\
3
o -
4
HEATER FAN SWITCH
1
2
.
^
3
I
4
5
6
^
Evaporator Temperature Sensor
Test
1. Dip the sensor in ice water, and measure the
resistance between its terminals.
EVAPORATOR TEMPERATURE SENSOR
T e r m i n a l s i d e o f m a l e t e r m i n a l s
2. Then pour hot water on the sensor, and check for a
change in resistance.
3. Compare the resistance readings with the
specifications shown in the graph; the resistance
should be within the specifications.
RESISTANCE
50
68
86°F
10
20
30°C
TEMPERATURE
21-23
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Troubleshooting
