Nissan Frontier D22. Manual - part 823

MTC-14

PREPARATION

Commercial Service Tool

EJS001ZW

For details of handling methods, refer to the Instruction Manual attached to the service tool.

(J-39699)
Refrigerant weight scale

For measuring of refrigerant
Fitting size: Thread size

●

1/2

″-16 ACME

(J-39649)
Vacuum pump
(Including the isolator valve)

Capacity:

●

Air displacement: 4 CFM

●

Micron rating: 20 microns

●

Oil capacity: 482 g (17 oz)

Fitting size: Thread size

●

1/2

″-16 ACME

Tool number
(Kent-Moore No.)
Tool name

Description 

S-NT200

S-NT203

Tool Number
Tool name

Description

(J-41810-NI)
Refrigerant identifier equipment HFC 
134a (R-134a)

Checking for refrigerant purity and system 
contamination

NT765

REFRIGERATION SYSTEM

MTC-15

C

D

E

F

G

H

I

K

L

M

A

B

MTC

REFRIGERATION SYSTEM

PFP:KA990

Refrigeration Cycle

EJS001ZX

REFRIGERANT FLOW

The refrigerant flows in the standard pattern. Refrigerant flows through the compressor, condenser, liquid tank,
expansion valve, evaporator, and back to the compressor. The refrigerant evaporation through the evaporator
coil is controlled by an externally equalized expansion valve, located inside the evaporator case.

FREEZE PROTECTION

The compressor cycles on and off to maintain the evaporator temperature within a specified range. When the
evaporator coil temperature falls below a specified point, the intake sensor interrupts the compressor opera-
tion. When the evaporator coil temperature rises above the specification, the intake sensor allows compressor
operation.

REFRIGERANT SYSTEM PROTECTION
Refrigerant Pressure Sensor

The refrigerant system is protected against excessively high or low pressure. The protection is effected by a
refrigerant pressure switch switch located on the condenser. If the pressure falls out of specifications, the
switch opens to interrupt compressor operation.

Pressure Relief Valve

The refrigerant system is also protected by a pressure relief valve located on the flexible high pressure hose
near the compressor. When the pressure of refrigerant in the system increases to an abnormal level [more
than 3,727 kPa (38 kg/cm

2

 , 540 psi)], the release port on the pressure relief valve automatically opens and

releases refrigerant into the atmosphere.

WJIA0673E

MTC-16

REFRIGERATION SYSTEM

Component Layout

EJS001ZY

WHA331

LUBRICANT

MTC-17

C

D

E

F

G

H

I

K

L

M

A

B

MTC

LUBRICANT

PFP:KLG00

Maintenance of Lubricant Quantity in Compressor

EJS001ZZ

The lubricant in the compressor circulates through the system with the refrigerant. Add lubricant to compres-
sor when replacing any component or after a large gas leakage occurred. It is important to maintain the speci-
fied amount.
If lubricant quantity is not maintained properly, the following malfunctions may result:

●

Lack of lubricant: May lead to a seized compressor

●

Excessive lubricant: Inadequate cooling (thermal exchange interference)

LUBRICANT

Name: NISSAN A/C System Lubricant Type R
Part number: KLH00-PAGR0

CHECKING AND ADJUSTING

Adjust the lubricant quantity according to the flowchart shown below.

1. 

LUBRICANT RETURN OPERATION

Can lubricant return operation be performed?

●

A/C system works properly.

●

There is no evidence of a large amount of lubricant leakage.

Yes or No

Yes

>> GO TO 2.

No

>> GO TO 3.

2. 

PERFORM LUBRICANT RETURN OPERATION, PROCEEDING AS FOLLOWS

1.

Start engine, and set the following conditions:

–

Test condition
Engine speed: Idling to 1,200 rpm
A/C switch: ON
RECIRCULATION switch: OFF
Fan speed: Max. position
Temp. control: Optional [Set so that intake air temperature is 25 to 30

°C (77 to 86°F).]

2.

Perform lubricant return operation for about 10 minutes.

3.

Stop engine.

CAUTION:

If excessive lubricant leakage is noted, do not perform the lubricant return operation.

>> GO TO 3.

3. 

CHECK COMPRESSOR

Should the compressor be replaced?

Yes or No

Yes

>> Refer to 

MTC-18, "Lubricant Adjusting Procedure for Compressor Replacement"

 .

No

>> GO TO 4.

4. 

CHECK ANY PART

Is there any part to be replaced? (Evaporator, condenser, liquid tank or in case there is evidence of a large
amount of lubricant leakage.)

Yes or No

Yes

>> Refer to 

MTC-18, "Lubricant Adjusting Procedure for Components Replacement Except Com-

pressor"

 .

No

>> Perform 

MTC-50, "PERFORMANCE TEST DIAGNOSES"

 .