check engine NISSAN PATROL 1998 Y61 / 5.G Heather And Air Conditioner User Guide

3. Move probe along component approximately 25 to 50 mm (1 to
2 in)/sec.
CHECKING PROCEDURE
To prevent inaccurate or false readings, make sure there is no
refrigerant vapor or tobacco smoke in the vicinity of the
vehicle. Perform the leak test in calm area (low air/wind move-
ment) so that the leaking refrigerant is not dispersed.
1. Turn engine off.
2. Connect a suitable A/C manifold gauge set to the A/C service
ports.
3. Check if the A/C refrigerant pressure is at least 345 kPa (3.452
bar, 3.52 kg/cm
2, 50 psi) above 16ÉC (61ÉF). If less than
speci®cation, evacuate and recharge the system with the speci-
®ed amount of refrigerant.
NOTE: At temperatures below 16ÉC (61ÉF), leaks may not be
detected since the system may not reach 345 kPa
(3.452 bar, 3.52 kg/cm
2, 50 psi).
4. Conduct the leak test from the high side to the low side at points
in alphabetical order (j
a,jb......). Refer to HA-117.
Perform a leak check for the following areas carefully. Clean the
component to be checked and move the leak detector probe
completely around the connection/component.
+Compressor
Check the ®tting of high and low pressure hoses, relief valve
and shaft seal.
+Liquid tank
Check the pressure switch, tube ®tting, weld seams and the
fusible plug mounts.
+Service valves
Check all around the service valves. Ensure service valve caps
are secured on the service valves (to prevent leaks).
NOTE: After removing A/C manifold gauge set from service
valves, wipe any residue from valves to prevent any
false readings by leak detector.
+Cooling unit (Evaporator)
Turn blower fan on ``High'' for at least 15 seconds to dissipate
any refrigerant trace in the cooling unit. Insert the leak detector
probe into the drain hose immediately after stopping the
engine. (Keep the probe inserted for at least ten seconds.)
5. If a leak detector detects a leak, verify at least once by blowing
compressed air into area of suspected leak, then repeat check.
6. Do not stop when one leak is found. Continue to check for
additional leaks at all system components.
7. Start engine.
8. Set the heater A/C control as follows:
a. A/C switch ON
b. Face mode
c. Recirculation switch ON
d. Max cold temperature
e. Fan speed high
SHA708EA
SERVICE PROCEDURESMANUAL AND AUTO
Checking Refrigerant Leaks (Cont'd)
HA-120

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.
Refrigerant leaks should be checked immediately after stop-
ping the engine. Begin with the leak detector on the high pres-
sure line. The pressure in the high pressure line will gradually
drop after refrigerant circulation stops and pressure in the low
pressure line will gradually rise, as shown in the graph. Leaks
are more easily detected when pressure is high.
11. Discharge A/C system using approved refrigerant recovery
equipment. Repair the leaking ®tting or component as neces-
sary.
12. Evacuate and recharge A/C system and perform the leak test
to con®rm no refrigerant leaks.
13. Conduct A/C performance test to ensure system works prop-
erly.
SHA839E
SERVICE PROCEDURESMANUAL AND AUTO
Checking Refrigerant Leaks (Cont'd)
HA-121

General Speci®cations
COMPRESSOR
Model ZEXEL make DKS-17CH
Type Swash plate
Displacement cm
3(cu in)/rev. 168 (10.25)
Cylinder bore x stroke mm (in) 37.0 x 25.8 (1.457 x 1.016)
Direction of rotationClockwise
(Viewed from drive end)
Drive belt A Type
LUBRICANT
Model ZEXEL make DKS-17CH
Type KLH00-PAGS0
Capacity m!(lmp ¯ oz)
Total in system 300 (10.6)
Compressor (Service parts)
charging amount300 (10.6)
Inspection and Adjustment
REFRIGERANT
Front A/C
Type HFC-134a (R-134a)
Capacity kg (lb)0.75 - 0.85
(1.65 - 1.87)
ENGINE IDLING SPEED (When A/C is ON.)
+Refer to EC section.
BELT TENSION
+Refer to MA section (``Checking Drive Belts'',
``ENGINE MAINTENANCE'').
COMPRESSOR
Model DKS-17CH
Clutch disc-to-pulley clearance
mm (in)0.3 - 0.6
(0.012 - 0.024)
SERVICE DATA AND SPECIFICATIONS
(SDS)MANUAL AND AUTO
HA-126