Section 22: HEATING AND AIR CONDITIONING
PA1562
6
NOTE
To perform a test of the driver's section
windshield defroster, it is possible to run the
system without running the engine.
The following 2% error chart and table can be
used to troubleshoot the driver’s area air
temperature sensor and the outside air
temperature sensor.
NOTE
The driver’s area air temperature sensor is
located behind the grill of the R.H. side
console (Refer to fig.12).
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
65 149 559
70 158 468
75 167 394
80 176 333
85 185 283
90 194 241
95 203 207
100 212 178
105 221 153
110 230 133
115 239 115
120 248 100
125 257 88
130 266 77
135 275 68
140 284 60
145 293 53
150 302 47
3.2 PASSENGERS’ SECTION OPERATION
The R.H. portion of the HVAC control unit
enables the selection of the temperature in the
passenger's area (refer to the Operator's Manual
for details).
FIGURE 5: CENTRAL HVAC SYSTEM CONTROL UNIT22296
Temperature control is provided in conjunction
with a thermistor sensor inside register duct,
located amidships on L.H. side of vehicle (Figs. 3
& 6).
FIGURE 6: THERMISTOR SENSOR 22064
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.
The evaporator fan motor, located in the
evaporator compartment, is protected by a 90
amps, manually-resettable (CB3) circuit breaker
located on the rear junction panel of the rear
electrical compartment (refer to Section 06,
“Electrical System” in this manual for details).
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