Opel Frontera UBS. Manual - part 13

00 – 24 SERVICE INFORMATION

CHECKING REFRIGERANT SYSTEM
WITH MANIFOLD GAUGE

Conditions;

•

Ambient temperature at approx. 25 

∼

30

°

C (77

∼

86

°

F)

•

Run the engine at Idling

•

A/C switch is “ON”

•

Run the blower motor at “4” (high) position

•

Temperature control knob sets at “MAX COLD”

•

Air source selector lever at “CIRC”

•

Close the all doors

Normal pressures

kpa (kg·cm

2

/ PSI);

Low-pressure side: 

Approx. 147 – 294 (1.5 – 3.0 / 21 – 43)

High-pressure side:

Approx. 1373 – 1863 (14 – 19 / 199 – 270 ) 

Connect the manifold gauge
Low-pressure hose (LOW)

∼

Suction side

High-pressure hose (HI)

∼

Discharge side 

(Low side)

(High side)

RESULT

SYMPTOM

TROUBLE CAUSE

CORRECTION

SERVICE INFORMATION  00 – 25

Reduced or no air flow through
the condenser

No bubbles in sight glass when
condenser is cooled by water
(Insufficient cooling)

After stopping air conditioning,
pressure drops approx. 196 kPa
(28 PSI) quickly

Insufficient cooling and excessive
bubbles in the sight glass

Low pressure gauge indicates
vacuum

Frost or dew on refrigerant line
before and after receiver/ drier or
expansion valve, and low pres-
sure gauge indicates vacuum

After turning off air conditioning,
high and low pressure gauge
balanced quickly

Low pressure gauge is lowered
after condenser is cooled by
water

Low pressure hose temperature
around the compressor refriger-
ant line connector is lower than
around evaporator

After turning off air conditioning,
high and low pressure gauge is
balanced quickly

Air conditioning turns off before
passenger compartment is suffi-
ciently cool

•

Condenser clogged or dirty

•

Radiator (condenser) fan
does not operate properly

•

Excessive refrigerant in
system

•

Air in system

•

Insufficient refrigerant in
system

•

Clogged or defective expan-
sion valve

•

Restriction caused by debris
or moisture in receiver/drier

•

Compressor seal defective

•

Poor compression due to
defective compressor gasket

•

Excessive refrigerant in
system

•

Unsatisfactory valve opera-
tion due to defective temper-
ature sensor of expansion
valve

•

Expansion valve opens too
long

•

Compressor gasket is defec-
tive

•

Electronic thermostat defec-
tive

•

Clean

•

Check cooling fan
operation

•

Check sight glass.

(See “Reading Sight
Glass”)

•

Discharge and
recover refrigerant.
Recharge to speci-
fied amount

•

Evacuate and
charge refrigerant
system

•

Check sight glass.
(See “Reading Sight
Glass”)

•

Check for leaks

•

Discharge and
recover refrigerant.
Recharge to speci-
fied amount

•

Replace the expan-
sion valve

•

Check system for
restriction and
replace
receiver/drier

•

Replace or repair
compressor

•

Discharge and
recover refrigerant
Recharge to speci-
fied amount

•

Replace the expan-
sion valve

•

Replace

•

Check the electronic
thermostat and
replace as neces-
sary

Discharge
(High) pres-
sure gauge
abnormally
high

Discharge
(High) pres-
sure gauge
abnormally
low

Suction
(Low) pres-
sure gauge
abnormally
high

*

For the charging and discharging operations in the table above, refer to “RECOVERY, RECYCLING,
EVACUATION AND CHARGING” in this section.

RESULT

SYMPTOM

TROUBLE CAUSE

CORRECTION

Suction
(Low) pres-
sure abnor-
mally low

Suction
(Low) and
Discharge
(High) pres-
sure abnor-
mally high

Suction
(Low) and
Discharge
(High) pres-
sure abnor-
mally low

00 – 26 SERVICE INFORMATION

•

Check sight
glass.(See “Reading
Sight Glass”)

•

Check for leaks 

•

Discharge and
recover refrigerant.
Recharge to speci-
fied amount

•

Replace the expan-
sion valve

•

Replace the receiv-
er/drier

•

Replace the expan-
sion valve

•

Check electronic
thermostat and
replace as necessary

•

Replace refrigerant
line

•

Check sight
glass.(See “Reading
Sight Glass”)

•

Discharge and
recover refrigerant.

Recharge to speci-
fied amount

•

Clean

•

Check cooling fan
operation

•

Evacuate and charge
refrigerant

•

Check sight glass.
(See “Reading Sight
Glass”)

•

Check for leaks 

•

Discharge and
recover refrigerant.
Recharge to speci-
fied amount

•

Insufficient refrigerant

•

Expansion valve clogged

•

Receiver/drier clogged

•

The temperature sensor of
the expansion valve is defec-
tive, and the valve cannot
regulate the correct flow of
the refrigerant

•

Frozen evaporator core fins

•

Clogged or blocked refriger-
ant line

•

Excessive refrigerant in
system

•

Condenser clogged

•

Radiator (condenser) fan
does not rotate properly

•

Air in system

•

Insufficient refrigerant in
system

Condenser is not hot and exces-
sive bubble in sight glass

Frost on the expansion valve inlet
line

A distinct difference in tempera-
ture between the inlet and outlet
refrigerant lines of the
receiver/drier

Expansion valve outlet refrigerant
line is not cold and low-pressure
gauge indicates vacuum

Discharge temperature is low and
air flow from vents is restricted

Low-pressure gauge reading is
low, or a vacuum reading may be
shown

No bubbles in sight glass after
condenser is cooled by water
(Insufficient cooling)

Reduce air flow through con-
denser

Suction (Low) pressure hose is
not cold

Insufficient cooling and excessive
bubbles in the sight glass

SERVICE INFORMATION  00 – 27

MAGNETIC CLUTCH

When the A/C switch and the fan control knob (fan
switch) are turned on with the engine running,
current flows through the thermostat and the com-
pressor relay to activate the magnetic clutch.
The air conditioning can be stopped by turning off
the A/C switch or the fan control knob (fan switch).
However, even when the air conditioning is in oper-

ation, the electronic thermostat, the pressure switch
or the PCM (6VD1/6VE1 Engine) is used to stop the
air conditioning temporarily by turning off the mag-
netic clutch in the prearranged conditions to reduce
the engine load which is being caused by the rise in
the engine coolant temperature, and the accelera-
tion of the vehicle, etc.

1

2

3

4

5

6

RELAY; A/C

B-36

C-20

10A

A/C

FL-1

80A

MAIN

1

2

B-2

C-25

2

4

X-5

1

3

(3)

(1)

4

1

3

2

4

1

A/C SW.

FAN SW.

I-23

PRESSURE
SW.

RELAY;
THERMOSTAT

B-2

X-7

C-25

C-1

C-3

E-3

I-23

BATTERY

X-7

RELAY: A/C
COMPRESSOR

1

E-3

MAGNETIC
CLUTCH

Mg

OFF

I-18

2

6

1

3 2 1

1 2 3

1

2

3

4

1 2

1

1

2

1

3

5

4

6

I-18

X-5

B-1

(LHD)

(RHD)

B-1

1

2

3

4

W/ CONDENSER

FAN

2

4

1

3

C-3

PCM (E15)

C-1

PCM (B14)

3

1

2

ELECTRONIC
THERMOSTAT

I-42

I-42

B-36

Pin number with (     ); RHD

A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16

B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16

E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11 E12 E13 E14 E15 E16

F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15 F16

6VD1/6VE1 ENGINE

D08RY00295