Infiniti G35 (V35). Manual - part 105

 

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Infiniti G35 (V35). Manual - part 105

 

 

ATC-92

TROUBLE DIAGNOSIS

PERFORMANCE CHART
Test Condition

Testing must be performed as follows:

Test Reading

Recirculating-to-discharge Air Temperature Table

Ambient Air Temperature-to-operating Pressure Table

*1: With the cooling fan motor low-speed control
*2: With the cooling fan motor high-speed control

Vehicle condition

Indoors or in the shade (in a well-ventilated place)

Doors

Closed

Door windows

Open

Hood

Open

TEMP.

Max. COLD

Mode switch

 (Ventilation) set

Recirculation (REC) switch

 (Recirculation) set

 Fan (blower) speed

Max. speed set

Engine speed

Idle speed

Operate the air conditioning system for 10 minutes before taking measurements.

Inside air (Recirculating air) at blower assembly inlet

Discharge air temperature at center ventilator

°

C (

°

F)

Relative humidity

%

Air temperature

°

C (

°

F)

50 - 60

20 (68)

9.2 - 10.4 (49 - 51)

25 (77)

12.0 - 14.0 (54 - 57)

30 (86)

14.4 - 17.4 (58 - 63)

35 (95)

18.2 - 22.0 (65 - 72)

40 (104)

23.8 - 27.4 (75 - 81)

60 - 70

20 (68)

10.4 - 11.8 (51 - 53)

25 (77)

14.0 - 16.0 (57 - 61)

30 (86)

17.4 - 20.8 (63 - 69)

35 (95)

22.0 - 25.2 (72 - 77)

40 (104)

27.4 - 31.0 (81 - 88)

Ambient air

High-pressure (Discharge side)

kPa (kg/cm

2

 , psi)

Low-pressure (Suction side)

kPa (kg/cm

2

 , psi)

Relative humidity

%

Air temperature

°

C (

°

F)

50 - 70

20 (68)

815 - 1,000 

*1

(8.3 - 10.2, 118 - 145)

220 - 260

(2.2 - 2.7, 32 - 38)

25 (77)

960 - 1,160 

*1

(9.8 - 11.8, 139 - 168)

230 - 280

(2.3 - 2.9, 33 - 41)

30 (86)

1,230 - 1,500

 *1 

(12.5 - 15.3, 178 - 218)

255 - 305

(2.6 - 3.1, 37 - 44)

35 (95)

1,200 - 1,460

  *2

(12.2 - 14.9, 174 - 212)

290 - 350

(3.0 - 3.6, 42 - 51)

40 (104)

1,330 -1,630

  *2

(13.6 - 16.6, 193 - 236)

335 - 410

(3.4 - 4.2, 49 - 59)

TROUBLE DIAGNOSIS

ATC-93

C

D

E

F

G

H

I

K

L

M

A

B

ATC

TROUBLE DIAGNOSIS FOR UNUSUAL PRESSURE 

Whenever system’s high and/or low side pressure(s) is/are unusual, diagnose using a manifold gauge. The
marker above the gauge scale in the following tables indicates the standard (usual) pressure range. Since the
standard (usual) pressure, however, differs from vehicle to vehicle, refer to above table (Ambient air tempera-
ture-to-operating pressure table).

Both High- and Low-pressure Sides are Too High

High-pressure Side is Too High and Low-pressure Side is Too Low

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Both high- and low-pressure 
sides are too high.

The pressure return to normal 
soon after water is splashed 
on condenser.

Excessive refrigerant charge in 
refrigeration cycle.

Reduce refrigerant until 
specified pressure is 
obtained.

Air suction by cooling fan is 
insufficient.

Insufficient condenser cooling perfor-
mance.

↓

1. Condenser fins are clogged.

2. Improper fan rotation of cooling 

fan.

●

Clean condenser.

●

Check and repair cooling 
fan if necessary.

●

Low-pressure pipe is not 
cold.

●

When compressor is 
stopped high-pressure 
value quickly drops by 
approximately 196 kPa (2 
kg/cm

2

 , 28 psi). It then 

decreases gradually there-
after.

Poor heat exchange in condenser
(After compressor operation stops, 
high-pressure decreases too 
slowly.).

↓

Air in refrigeration cycle.

Evacuate repeatedly and 
recharge system.

Engine tends to overheat.

Engine cooling systems malfunction.

Check and repair each 
engine cooling system.

●

An area of the low-pres-
sure pipe is colder than 
areas near the evaporator 
outlet.

●

Low-pressure pipe is 
sometimes covered with 
frost.

●

Excessive liquid refrigerant on low-
pressure side.

●

Excessive refrigerant discharge 
flow.

●

Expansion valve is open a little 
compared with the specification.

 

↓

Improper expansion valve adjust-
ment.

Replace expansion valve.

AC359A

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

High-pressure side is too high 
and low-pressure side is too low.

Upper side of condenser and 
high-pressure side are hot, 
however, liquid tank is not so 
hot.

High-pressure tube or parts located 
between compressor and condenser 
are clogged or crushed.

●

Check and repair or 
replace malfunctioning 
parts.

●

Check lubricant for 
contamination.

AC360A

ATC-94

TROUBLE DIAGNOSIS

High-pressure Side is Too Low and Low-pressure Side is Too High

Both High- and Low-pressure Sides are Too Low

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

High-pressure side is too low 
and low-pressure side is too 
high.

High- and low-pressure sides 
become equal soon after com-
pressor operation stops.

Compressor pressure operation 
is improper.

↓

Damaged inside compressor 
packings.

Replace compressor.

No temperature difference 
between high- and low-pres-
sure sides.

Compressor pressure operation 
is improper.

↓

Damaged inside compressor 
packings.

Replace compressor.

AC356A

Gauge indication

Refrigerant cycle

Probable cause

Corrective action

Both high- and low-pressure 
sides are too low.

●

There is a big temperature 
difference between liquid tank 
outlet and inlet. Outlet tem-
perature is extremely low.

●

Liquid tank inlet and expan-
sion valve are frosted.

Liquid tank inside is slightly 
clogged.

●

Replace liquid tank.

●

Check lubricant for contami-
nation.

●

Temperature of expansion 
valve inlet is extremely low as 
compared with areas near liq-
uid tank.

●

Expansion valve inlet is 
frosted.

●

Temperature difference 
occurs somewhere in high-
pressure side.

High-pressure pipe located 
between liquid tank and expan-
sion valve is clogged.

●

Check and repair malfunc-
tioning parts.

●

Check lubricant for contami-
nation.

Expansion valve and liquid tank 
are warm or slightly cool when 
touched.

Low refrigerant charge.

↓

Leaking fittings or components.

Check refrigerant for leaks. 
Refer to 

ATC-151, "Checking 

for Refrigerant Leaks"

 .

There is a big temperature dif-
ference between expansion 
valve inlet and outlet while the 
valve itself is frosted.

Expansion valve closes a little 
compared with the specifica-
tion.

↓

1. Improper expansion valve 

adjustment.

2. Malfunctioning expansion 

valve.

3. Outlet and inlet may be 

clogged.

●

Remove foreign particles by 
using compressed air.

●

Replace expansion valve.

●

Check lubricant for contami-
nation.

An area of the low-pressure 
pipe is colder than areas near 
the evaporator outlet.

Low-pressure pipe is clogged or 
crushed.

●

Check and repair malfunc-
tioning parts.

●

Check lubricant for contami-
nation.

Air flow volume is not enough or 
is too low.

Evaporator is frozen.

●

Check intake sensor circuit.
Refer to 

ATC-109, "Intake 

Sensor Circuit"

 .

●

Replace compressor.

●

Repair evaporator fins.

●

Replace evaporator.

●

Refer to 

ATC-77, "Blower 

Motor Circuit"

 .

AC353A

 

 

 

 

 

 

 

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