Nissan Terrano r20e. Instruction — part 346
Operation Check
The purpose of the operational check is to confirm that the system
is as it should be. The systems which will be checked are the
blower, mode (discharge air), intake air, temperature decrease,
temperature increase and A/C switch system.
CONDITIONS:
Engine running and at normal operating temperature.
PROCEDURE:
1. Check blower
1) Turn FAN CONTROL DIAL to 1.
Blower should operate at speed 1.
2) Then turn the DIAL to speed 2.
3) Continue checking blower speed until all speeds are checked.
4) Leave blower on speed 4.
2. Check discharge air
1) Turn AIR CONTROL DIAL to
position.
2) Confirm that all discharge air comes out of face vents.
3) Turn AIR CONTROL DIAL to
position.
4) Confirm that discharge air comes out of face vents and foot
vents.
5) Turn AIR CONTROL DIAL to
position.
6) Confirm that discharge air comes out of foot vents, with some
air from face vents.
7) Turn AIR CONTROL DIAL to
position.
8) Confirm that discharge air comes out of foot vents with some
air from defroster vents.
9) Turn AIR CONTROL DIAL to
position.
10) Confirm that all discharge air comes out of defroster vents, with
some air from face vents.
3. Check recirculation
1) Switch AIR RECIRCULATION SWITCH to ON position (Indica-
tor light ON).
2) Listen for intake door position change (you should hear sound
change slightly).
NHA333
NHA334
RHA035E
NHA335
DIAGNOSES — Overall System
HA-28
4. Check temperature decrease
1) Turn TEMPERATURE CONTROL DIAL to full cold (counter-
clockwise).
2) Check for cold air at discharge air outlets.
5. Check temperature increase
1) Turn TEMPERATURE CONTROL DIAL to full hot (clockwise).
2) Check for hot air at discharge air outlets.
6. Check A/C switch
Turn FAN CONTROL DIAL to the desired position (1 to 4) and
switch AIR CONDITIONER SWITCH to turn ON air conditioner.
Indicator light will come on when air conditioner is ON.
NHA336
NHA337
NHA338
DIAGNOSES — Overall System
Operation Check (Cont’d)
HA-29
Performance Chart
TEST CONDITION
Testing must be performed as follows:
Vehicle location:
Indoors or in the shade (in a well-ventilated place)
Doors:
Closed
Door window:
Open (Front driver side only)
Hood:
Open
TEMP. control lever position:
Max. COLD
AIR control lever position:
(Ventilation)
INTAKE lever position:
(Recirculation)
FAN lever:
4
Engine speed:
1,500 rpm
Time required before starting testing
after air conditioner starts operating:
More than 10 minutes
TEST READING
Recirculating-to-discharge air temperature table
Inside air (Recirculating air)
at blower assembly inlet
Discharge air temperature at center ventilator
°C (°F)
Relative humidity
%
Air temperature
°C (°F)
40 - 60
25 (77)
9.8 - 11.5 (50 - 53)
30 (86)
13.8 - 15.9 (57 - 61)
35 (95)
17.9 - 20.3 (64 - 69)
60 - 80
25 (77)
11.5 - 13.3 (53 - 56)
30 (86)
15.9 - 18.0 (61 - 64)
35 (95)
20.3 - 22.7 (69 - 73)
Ambient air temperature-to-compressor pressure table
Ambient air
High-pressure (Discharge side)
kPa (bar, kg/cm
2
, psi)
Low-pressure (Suction side)
kPa (bar, kg/cm
2
, psi)
Relative humidity
%
Air temperature
°C (°F)
40 - 80
25 (77)
1,451 - 1,608 (14.51 - 16.08,
14.8 - 16.4, 210 - 233)
157 - 186 (1.57 - 1.86, 1.6 - 1.9,
23 - 27)
30 (86)
1,569 - 1,804 (15.69 - 18.04,
16.0 - 18.4, 228 - 262)
176 - 235 (1.76 - 2.35, 1.8 - 2.4,
26 - 34)
35 (95)
1,834 - 2,138 (18.34 - 21.38,
18.7 - 21.8, 266 - 310)
226 - 304 (2.26 - 3.04, 2.3 - 3.1,
33 - 44)
DIAGNOSES — Overall System
HA-30
Performance Test Diagnoses
INSUFFICIENT COOLING
MHA176B
DIAGNOSES — Overall System
HA-31
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