SECTION 22: HEATING AND AIR CONDITIONING
10
DOB 2490-2789 | X3-45 Commuter PA1605 Maintenance Manual (Final Version – Rev.2 April 2016)
NOTE
The driver’s area air temperature sensor is
located below the dashboard, just ahead of
the driver's right knee.
1) Driver’s area temperature sensor (SE21);
2) Passengers’ area temperature sensor (SE25);
3) Outside air temperature sensor (SE20).
The table values are for unloaded, disconnected
temperature sensor (thermistor) probed at the
temperature sensor connector pins.
TEMPERATURE SENSOR
Temp °C
Temp °F
Resistance Ohms
-40 -40
100865
-35 -31
72437
-30 -22
52594
-25 -13
38583
-20 -4
28582
-15 5
21371
-10 14
16120
-5 23
12261
0 32
9399
5 41
7263
10 50
5658
15 59
4441
20 68
3511
25 77
2795
30 86
2240
35 95
1806
40 104
1465
45 113
1195
50 122
980
55 131
808
60 140
670
3.2 PASSENGERS’ SECTION OPERATION
The passengers’ section has a preset
temperature of 68°F (20°C).
FIGURE 8: HVAC SYSTEM CONTROL UNIT
Temperature control is provided in conjunction with
a thermistor sensor inside register duct, located on
L.H. side of vehicle (FIGURE 3 & Figure 6).
FIGURE 9: TEMPERATURE SENSOR
The flow of water to the vehicle's main heater
core is controlled by a pneumatic water valve
which varies the cycling rate depending on
selected temperature. A red LED, located on
HVAC control unit, illuminates when heating
mode is selected. A green LED illuminates when
compressor clutch is in operation.
NOTE
It is not uncommon for both the red Heat LED
and the green AC LED to be illuminated at the
same time. This indicates that the temperature
control is requesting heat and the HVAC control
is calling for compressor operation for
dehumidification.
FIGURE 10: EVAPORATOR COMPARTMENT
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