Infiniti QX4 (R50). Manual — part 490
5.
If a leak detector detects a leak, verify at least once by blow-
ing compressed air into area of suspected leak, then repeat
check as outlined above.
6.
Do not stop when one leak is found. Continue to check for
additional leaks at all system components.
If no leaks are found, perform steps 7 - 10.
7.
Start engine.
8.
Set the heater A/C control as follows:
1)
A/C switch ON.
2)
Face mode
3)
Recirculation switch ON
4)
Max cold temperature
5)
Fan speed high
9.
Run engine at 1,500 rpm for at least 2 minutes.
10. Turn engine off and perform leak check again following steps
4 through 6 above.
SHA839E
Refrigerant leaks should be checked immediately after
stopping the engine. Begin with the leak detector at the
compressor. The pressure on the high pressure side will
gradually drop after refrigerant circulation stops and pres-
sure on the low pressure side will gradually rise, as shown
in the graph. Some leaks are more easily detected when
pressure is high.
11. Before connecting ACR4 to vehicle, check ACR4 gauges. No
refrigerant pressure should be displayed. If pressure is
displayed, recover refrigerant from equipment lines and then
check refrigerant purity.
12. Confirm refrigerant purity in supply tank using ACR4 and refrig-
erant identifier.
13. Confirm refrigerant purity in vehicle A/C system using ACR4
and refrigerant identifier.
14. Discharge A/C system using approved refrigerant recovery
equipment. Repair the leaking fitting or component as neces-
sary.
15. Evacuate and recharge A/C system and perform the leak test
to confirm no refrigerant leaks.
16. Conduct A/C performance test to ensure system works
properly.
SERVICE PROCEDURE
Refrigerant Lines (Cont’d)
HA-158
Belt
TENSION ADJUSTMENT
NBHA0079
I
Refer to MA-13, “Checking Drive Belts”.
RHA042G
Ventilation Air Filter
FUNCTION
NBHA0108
Air inside passenger compartment is kept clean at either recircula-
tion or fresh mode by installing ventilation air filter into cooling unit.
NOTE:
To replace ventilation air filter, refer to MA-6, “Periodic Main-
tenance”.
Caution label is fixed inside the glove box.
SHA252F
REPLACEMENT PROCEDURE
NBHA0109
1.
Remove glove box.
2.
Remove instrument lower panel from instrument panel.
3.
Remove ventilation air filter fixed clip.
SHA253F
4.
Take out the lower side ventilation air filter from cooling unit.
5.
Then slide upper side filter to the bottom position and take off
the ventilation air filter from the cooling unit.
6.
Replace with new one and reinstall on cooling unit.
7.
Reinstall clip, instrument lower panel and glove box.
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
SC
EL
IDX
SERVICE PROCEDURE
Belt
HA-159
Compressor
NBHA0081
Model
CALSONIC make V-6
Type
V-6 variable displacement
Displacement
cm
3
(cu in)/rev.
Max.
184 (11.228)
Min.
14.5 (0.885)
Cylinder bore x stroke
mm (in)
37 (1.46) x [2.3 - 28.6 (0.091 - 1.126)]
Direction of rotation
Clockwise (viewed from drive end)
Drive belt
Poly V
Lubricant
NBHA0082
Model
CALSONIC make V-6
Name
Nissan A/C System Oil Type S
Part number*
KLH00-PAGS0
Capacity
m
(US fl oz, Imp fl oz)
Total in system
200 (6.8, 7.0)
Compressor (Service part) charging amount
200 (6.8, 7.0)
*: Always check with the Parts Department for the latest parts information.
Refrigerant
NBHA0083
Type
HFC-134a (R-134a)
Capacity
kg (lb)
0.60 - 0.70 (1.32 - 1.54)
Engine Idling Speed (When A/C is ON)
NBHA0084
I
Refer to EC-649, “Idle Speed and Ignition Timing”.
Belt Tension
NBHA0085
I
Refer to MA-29, “Engine Maintenance”.
SERVICE DATA AND SPECIFICATIONS (SDS)
Compressor
HA-160
ALPHABETICAL INDEX
SECTION
IDX
GI
MA
EM
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
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