Infiniti Q45 (FY33). Manual — part 490
HFC-134a (R-134a) Service Procedure
Before connecting ACR4 to vehicle,
check ACR4 gauges. No refrigerant
pressure should be displayed.
If NG, recover refrigerant from equip-
ment lines.
Confirm refrigerant purity in supply
tank using ACR4 and refrigerant identi-
fier.
OK
E
NG
Refer to Contaminated refriger-
ant. (Refer to HA-3.)
Connect ACR4 to vehicle.
Confirm refrigerant purity in vehicle
A/C system using ACR4 and refriger-
ant identifier.
OK
E
NG
Refer to Contaminated refriger-
ant. (Refer to HA-3.)
Set the recovery/recycling equipment.
Recovered lubricant. Refer to
CHECKING AND ADJUSTING
(HA-128).
E
Discharge refrigerant into recovery/
recycling equipment.
Repair or replace parts.
Evacuate (over 25 minutes).
F
Check air tightness.
OK
*1
E
NG
Repair.
G
Partial charging [approx. 200 g
(7.05 oz)].
Preliminary refrigerant leak check.
Refer to “PRELIMINARY CHECK”,
OK
*1
E
NG
Complete charging (specified amount
less partial charge amount)
(Refer to SDS.)
*2
Check for refrigerant leaks.
Refer to “CHECKING PROCEDURE”,
OK
NG
Check for A/C operation and A/C cool-
ing performance.
. . . . ..
Performance Test Diagnoses
(Refer to HA-63.)
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SERVICE PROCEDURES
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HA-125
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Remove service couplers from A/C
service valves.
Recover refrigerant in charging hoses.
Remove service tools.
Reinstall service valve caps.
Note: *1 Before charging refrigerant, ensure engine is off.
*2 Before checking for leaks, start engine to activate air conditioning system then turn engine off.
Service valve caps must be installed to prevent leakage.
SERVICE PROCEDURES
HFC-134a (R-134a) Service Procedure (Cont’d)
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HA-126
SETTING OF SERVICE TOOLS AND EQUIPMENT
DISCHARGING REFRIGERANT
WARNING:
Avoid breathing A/C refrigerant and lubricant vapor or mist. Exposure may irritate eyes, nose and
throat. Remove HFC-134a (R-134a) from A/C system using certified service equipment meeting require-
ments of SAE J2210 (R-134a recycling equipment), or J2209 (R-134a recovery equipment). If acciden-
tal system discharge occurs, ventilate work area before resuming service. Additional health and safety
information may be obtained from refrigerant and lubricant manufacturers.
SHA179FA
EVACUATING SYSTEM AND CHARGING REFRIGERANT
SHA180FA
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SERVICE PROCEDURES
HFC-134a (R-134a) Service Procedure (Cont’d)
HA-127
Maintenance of Lubricant Quantity in
Compressor
The lubricant in the compressor circulates through the system with
the refrigerant. Add lubricant to compressor when replacing any
component or after a large gas leakage occurred. It is important to
maintain the specified amount.
If lubricant quantity is not maintained properly, the following mal-
functions may result:
I
Lack of lubricant: May lead to a seized compressor
I
Excessive lubricant: Inadequate cooling (thermal exchange
interference)
LUBRICANT
Name: Nissan A/C System Oil Type S
Part number: KLH00-PAGS0
CHECKING AND ADJUSTING
Adjust the lubricant quantity according to the flowchart shown
below.
START
Can lubricant return operation be per-
formed?
I
A/C system works properly.
I
There is no evidence of a large amount of
lubricant leakage.
No
E
Yes
Perform lubricant return operation, proceeding as follows:
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1. Start engine, and set the following conditions:
I
Test condition
Engine speed: Idling to 1,200 rpm
A/C or AUTO switch: ON
Blower speed: Max. position
Temp. control: Optional [Set so that intake air temperature is
25 to 30°C (77 to 86°F).]
2. Next item is for V-6 compressor. Connect the manifold gauge, and
check that the high pressure side pressure is 588 kPa (6 kg/cm
2
,
85 psi) or higher.
If less than the reference level, attach a cover to the front face of
the condenser to raise the pressure.
3. Perform lubricant return operation for about 10 minutes.
4. Stop engine.
CAUTION:
If excessive lubricant leakage is noted, do not perform the lubricant
return operation.
Should the compressor be replaced?
No
Yes
F
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(Go to next page.)
Is there any part to be replaced?
(Evaporator, condenser, liquid tank or in
case there is evidence of a large amount of
lubricant leakage.)
No
E
Yes
After replacing any of the following major components, add the correct
amount of lubricant to the system.
Amount of lubricant to be added
*1: If compressor is replaced, addition of lubricant is included in the flow
chart.
*2: If refrigerant leak is small, no addition of lubricant is needed.
Carry out the A/C performance test.
F
Part replaced
Lubricant to be added to
system
Remarks
Amount of lubricant
m
(US fl oz, Imp fl oz)
Evaporator
75 (2.5, 2.6)
—
Condenser
75 (2.5, 2.6)
—
Liquid tank
5 (0.2, 0.2)
Add if compressor is not
replaced. *1
In case of refrigerant leak
30 (1.0, 1.1)
Large leak
—
Small leak*2
SERVICE PROCEDURES
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HA-128
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