Opel Frontera UE. Manual - part 1231

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–45

A/C — Air Conditioning

Suction (Low Gauge) Pressure
Abnormally Low
Receiver/drier inlet and outlet
refrigerant line temperature. (A
distinct difference in temperature
develops.)

Receiver/Drier clogged.

Replace the receiver/drier.

Suction (Low Gauge) Pressure
Abnormally Low.
Expansion valve outlet refrigerant
line. (Not cold and low pressure
gauge indicates vacuum.)

Expansion valve temperature sensor
is defective.

Replace the expansion valve.

Suction (Low Gauge) Pressure
Abnormally Low.
When the refrigerant line is clogged
or blocked,     the low pressure
gauge reading will decrease, or a
vacuum reading may be shown.

Clogged or blocked refrigerant line.

Replace refrigerant line.

Suction (Low Gauge) Pressure
Abnormally Low.
Evaporator core is frozen.

Thermo switch defective.

Replace thermo switch.

Suction (Low Gauge) and Discharge
(High Gauge) Pressure Abnormally
High.
Insufficient cooling.

Excessive refrigerant in system.

Discharge 

and 

recover 

the

refrigerant, the Recharge to the
specified amount.

Condenser clogged or dirty.

Clean the condenser fin.

Suction (Low Gauge) and Discharge
(High Gauge) Pressure Abnormally
High.
Suction (Low) pressure hose (Not
cold).

Air in system.

Evacuate and charge refrigerant.

Suction (Low Gauge) and Discharge
(High Gauge) Pressure Abnormally
Low.
Insufficient cooling

Insufficient refrigerant in system.

Check  for  leaks.  Discharge  and
recover refrigerant. Recharge to
specified amount.

Condition

Possible cause

Correction

SECTION

1A–46

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Magnetic Clutch Diagnosis

D08R100144

When the air conditioning switch and the fan control
knob (fan switch) are turned on with the engine running,

current flows through the thermostat and the
compressor relay to activate the magnetic clutch.

SECTION

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–47

The air conditioning can be stopped by turning of the air
conditioning switch or the fan control knob (fan switch).
However, even when the air conditioning is in operation,
the electronic thermostat, the pressure switch or the
Powertrain Control Module (PCM;V6-3.2L) is used to
stop the air conditioning temporarily     by turning off the

magnetic clutch in the prearranged conditions to reduce
the engine load which is being     caused by the rise in
the engine coolant temperature, and the acceleration of
the vehicle, etc.
For the inspection of the relays, switches and units in
the table, refer to “Individual Inspection" in this section.

Magnetic Clutch Does Not Run

Step

Action

Value(s)

Yes

No

1 

Is the fuse No. F-5 normal?

—

Go to Step 2

Replace the 

fuse

2 

Is the relay No.X-1 (heater relay). No.X-8 (Thermostat
relay) and No.X-2 (compressor relay) normal?

—

Go to Step 3

Replace the 

relay

3 

Is pressure switch normal?

—

Go to Step 4

Place the 

pressure 

switch.

4 

Is the air conditioner switch and the fan control switch
normal?

—

Go to Step 5

Replace the A/

C switch and 

fan control 

switch

5 

1. Turn the ignition switch “ON" (the engine is run).

2. Turn the air conditioner switch and the fan control

switch on.

Is the battery voltage applied between harness side
connector terminal No.E3-1 and ground?

Approx.12V

Go to Step 6

Go to Step 7

6 

Repair an open circuit between compressor side
terminal and ground or replace compressor.
Is the action complete?

—

Varify  repair

—

7 

Is there continuity between harness side connector
terminal No.X2-1 and No.E3-1?

—

Go to Step 9

Go to Step 8

8 

Repair an open circuit between terminal No.X2-1 and
No.E3-1.
Is the action complete?

—

Go to Step 7

—

9 

Is the battery voltage applied between harness side
connector terminal No.X2-2 and ground, No.X2-5 and
ground?

Approx.12V

Go to Step 11

Go to Step 10

10 

Repair and open circuit between terminal No.X2-2 and
No.F-5 fuse, No.X2-5 and No.F-5 fuse.
Is the action complete?

—

Go to Step 9

—

11 

Is there continuity between harness side connector
terminal No.X2-4 and No.E21-F4?

—

Go to Step 13

Go to Step 12

12 

Repair an open circuit between terminal No.X2-4 and
No.E21-F4.
Is the action complete?

—

Go to Step 11

—

13 

Is the battery voltage applied between harness side
connector terminal No.I24-2 and ground?

Approx.12V

Go to Step 15

Go to Step 14

14 

Repair an open circuit between terminal No.I24-2 and
No.F-5 fuse.
Is the action complete?

—

Go to Step 13

—

15 

Is the battery voltage applied between harness side
connector terminal No.C69-3 and ground?

Approx.12V

Go to Step 17

Go to Step 16

SECTION

1A–48

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Magnetic Clutch Does Not Run (Cont’s)

CAUTION:  There are condition whitch air
conditioner system does not operate except trouble
as follows.

1. The throttle is greater than 90%.

2. The ignition voltage is below 10.5 volts.

3. The engine speed is greater than 4500 RPM for 5

seconds or 5400 RPM.

4. The engine coolant temperature (ECT) is greater

than 125

°

C (257

°

F).

5. The intake air temperature (IAT) is less than 5

°

C

(41

°

F).

6. The power steering pressure switch signals a high

pressure condition.

Step

Action

Value(s)

Yes

No

16 

Repair an open circuit between terminal No.C69-3
and No.I24-1.
Is the action complete?

—

Go to Step 15

—

17 

Is there continuity between harness side connector
terminal No.I23-6 and No.C69-2?

—

Go to Step 19

Go to Step 18

18 

Repair an open circuit between terminal No.I23-6 and
No.C69-2.
Is the action complete?

—

Go to Step 17

—

19 

Is there continuity between harness side connector
terminal No.I23-1 and ground (No.B-8)?

—

Go to Step 21

Go to Step 20

20 

Repair an open circuit between terminal No.I23-1 and
No.B-8.
Is the action complete?

—

Go to Step 19

—

21 

Is the battery voltage applied between harness side
connector terminal No.C11-2 and ground?

—

Go to Step 23

Go to Step 22

22 

Repair an open circuit between terminal No.C11-2
and No.F-5 fuse.
Is the action complete?

—

Go to Step 21

—

23 

Is the battery voltage applied between harness side
connector terminal No.X8-3 and ground?

—

Go to Step 25

Go to Step 24

24 

Repair an open circuit between terminal No.X8-3 and
No.C11-1.
Is the action complete?

—

Go to Step 23

—

25 

Is the battery voltage applied between harness side
connector terminal No.C69-1 and ground?

—

Go to Step 27

Go to Step 26

26 

Repair an open circuit between terminal No.C69-1
and No.X8-5.
Is the action complete?

—

Go to Step 25

—

27 

Is there continuity between harness side connector
terminal No.X8-2 and No.E21-F45?

—

Go to Step 29

Go to Step 28

28 

Repair an open circuit between terminal No.X8-2 and
No.E21-F45.
Is the action complete?

—

Verify repair

—

29 

Replace the PCM.
Is the action complete?

—

Verify repair

—

SECTION