ATC (Automatic Temperature Control) System:
• Rotate blower knob to high position (full clock-
wise)
• Set temperature to the LO position
• Push panel mode button
• Push RECIRC (Recirculation) button (A/C and
RECIRC symbols should be lit)
NOTE: The word MANUAL should appear in the
ATC display, confirming that the system is set man-
ually.
(3) Start engine and hold at 1000 rpm with A/C
clutch engaged.
(4) Engine should be warmed up with doors and
windows closed.
(5) Insert a thermometer in the left center A/C
outlet and operate the engine for five minutes. The
A/C clutch may cycle depending on ambient condi-
tions.
(6) With the A/C clutch engaged, compare the
discharge air temperature to the A/C Performance
Temperature table.
A/C PERFORMANCE TEMPERATURE AND PRESSURE
AMBIENT TEMPERATURE
21°C
(70°F)
26.5°C
(80°F)
32.5°C
(90°F)
37°C
(100°F)
43°C
(110°F)
MAXIMUM ALLOWABLE AIR
TEMPERATURE AT CENTER
LEFT PANEL OUTLET
6°C
(42°F)
7°C
(45°F)
10°C
(50°F)
12°C
(54°F)
15°C
(59°F)
COMPRESSOR DISCHARGE
PRESSURE
1379–1585
kPa
(200–230
psi)
1448–1723
kPa
(210–250
psi)
1654–1930
kPa
(240–280
psi)
1930–2206
kPa
(280–320
psi)
2206–2516
kPa
(320–365 psi)
COMPRESSOR SUCTION
PRESSURE
103–172 kPa
(15–25 psi)
139–208 kPa
(20–30 psi)
172–241 kPa
(25–35 psi)
208–276 kPa
(30–40 psi)
241–310 kPa
(35–45 psi)
ATC IN-CAR TEMPERATURE SENSOR
(1) Perform air flow test to check motor/fan assem-
bly.
(a) Turn ignition to the ON position and push
the OFF button to stop the ATC system airflow.
This will make it easier to observe paper in the
step Step b.
(b) Place a small piece of newspaper in front of
the sensor/motor opening on the ATC control. If the
paper sticks to the opening, the In-Car sensor/mo-
tor is operating properly. The piece of paper should
be only large enough to cover the grille opening.
(2) Check if the electrical connection and connector
are OK.
COMPRESSOR
The compressor used on this vehicle is a Nippon-
denso 10PA17 R134a. This compressor uses an alu-
minum swash plate, teflon coated pistons and
aluminum cylinder walls. One-way check valves are
used to regulate refrigerant flow through the com-
pressor.
CAUTION: A 10PA17 R-12 compressor looks identi-
cal to a 10PA17 R134a and will bolt up to this vehi-
cle. It is extremely important that a R-134a
compressor is identified prior to using compressor
in question. Check tag located on compressor for
model number.
Excessive noise that occurs when the air-condition-
ing is being used may be caused by:
• Loose Bolts
• Mounting Brackets
• Loose Compressor Clutch
• Excessive High Refrigerant Operating Pressure
Verify the following before compressor repair is
performed:
(1) Compressor drive belt condition
(2) Proper refrigerant charge
(3) Thermal expansion valve (TXV) operating cor-
rectly
(4) Head pressure is normal
EXPANSION VALVE
The expansion valve is located on the engine side
of the dash panel, near the right shock tower.
The expansion valve can fail in three different
positions (open, closed or restricted). Note, that in
each case, it is defective and requires replace-
ment.
LH HEATING AND AIR CONDITIONING 24 - 7
DIAGNOSIS AND TESTING (Continued)
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