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Opel Frontera UE. Manual - part 622

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–45

Magnetic Clutch Does Not Run (Cont’s)

CAUTION: There are condition whitch air
conditioner system dose 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

(41

F).

6. The power steering pressure switch signals a high

pressure condition.

Step

Action

Value(s)

Yes

Repair an open circuit between terminal No.B4-3 and
No.I24-1.
Is the action complete?

—

Go to Step 15

—

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

—

Go to Step 19

Go to Step 18

Repair an open circuit between terminal No.I23-6 and
No.B4-2.
Is the action complete?

—

Go to Step 17

—

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

—

Go to Step 21

Go to Step 20

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

—

Go to Step 19

—

Is the battery voltage applied between harness side
connector terminal No.C11-1 and ground?

—

Go to Step 23

Go to Step 22

Repair an open circuit between terminal No.C11-1
and No.F-5 fuse.
Is the action complete?

—

Go to Step 21

—

Is the battery voltage applied between harness side
connector terminal No.X5-2 and ground?

—

Go to Step 25

Go to Step 24

Repair an open circuit between terminal No.X5-2 and
No.C11-2.
Is the action complete?

—

Go to Step 23

—

Is the battery voltage applied between harness side
connector terminal No.B4-1 and ground?

—

Go to Step 27

Go to Step 26

Repair an open circuit between terminal No.B4-1 and
No.X5-4.
Is the action complete?

—

Go to Step 25

—

Is there continuity between harness side connector
terminal No.X5-1 and No.C3-E15?

—

Go to Step 29

Go to Step 28

Repair an open circuit between terminal No.X5-1 and
No.C3-E15.
Is the action complete?

—

Verify repair

—

Replace the PCM.
Is the action complete?

—

Verify repair

—

1A–46

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Individual Inspection

Fan Control Knob (Fan Switch) And Air
Conditioning (A/C) Switch

1. Check for continuity between the fan switch and the

A/C switch side connector terminals.

D08RX254

EndOFCallout

Heater (X-6), Thermostat (X-5), Condenser
Fan (X-9) And Compressor (X-4) Relay

1. Disconnect relays and check for continuity and

resistance between relay terminals.

• For handling of these relays, refer to Heater Relay

in this section.

901RX071

Pressure Switch

1. Disconnect pressure switch connector and check for

continuity between pressure switch side connector
terminals (1) and (2).

875RY00024

Legend

(1) A/C Switch Connector (switch side)
(2) Fan Switch Connector (switch side)

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–47

General Repair Procedure

Precautions For Replacement or Repair of
Air Conditioning Parts

There are certain procedures, practices and
precautions that should be followed when servicing air
conditioning systems:

• Keep your work area clean.

• Always wear safety goggle and protective gloves

when working on refrigerant systems.

• Beware of the danger of carbon monoxide fumes

caused by running the engine.

• Beware of discharged refrigerant in enclosed or

improperly ventilated garages.

• Always disconnect the negative battery cable and

discharge and recover the refrigerant whenever
repairing the air conditioning system.

• When discharging and recovering the refrigerant, do

not allow refrigerant to discharge too fast; it will draw
compressor oil out of the system.

• Keep moisture and contaminants out of the system.

When disconnecting or removing any lines or parts,
use plugs or caps to close the fittings immediately.
Never remove the caps or plugs until the lines or
parts are reconnected or installed.

• When disconnecting or reconnecting the lines, use

two wrenches to support the line fitting, to prevent
from twisting or other damage.

• Always install new O-rings whenever a connection is

disassembled.

• Before connecting any hoses or lines, apply new

specified compressor oil to the O-rings.

• When removing and replacing any parts which

require discharging the refrigerant circuit, the
operations described in this section must be
performed in the following sequence:

1 Use the J-39500 (ACR

: HFC-134a Refrigerant

Recovery / Recycling / Recharging / System) or
equivalent to thoroughly discharge and recover
the refrigerant.

2 Remove and replace the defective part.

3 After evacuation, charge the air conditioning

system and check for leaks.

Repair Of Refrigerant Leaks

Refrigerant Line Connections

Install new O-rings, if required. When disconnecting or
connecting lines, use two wrenches to prevent the
connecting portion from twisting or becoming damaged.

852RS003

When connecting the refrigerant line at a block joint,
securely insert the projecting portion of the joint portion
into the connecting hole on the unit side and secure with
a bolt. Apply the specified compressor oil to the
O-rings prior to connecting.

CAUTION: Compressor (PAG) oil to be used varies
according to the compressor model. Be sure to
apply oil specified for the model of compressor.

850RW002

1A–48

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

O-rings (2) must be fitted in the groove (1) of refrigerant
line.

850RW003

Insert the nut into the union.
First, tighten the nut by hand as much as possible, then
tighten the nut to the specified torque.

Leak Check

Inspection of refrigerant leak

Refrigerant leak may cause an adverse effect not only
on the performance and durability of each component of
the air-conditioner, but also on the global atmosphere.
Therefore, it is most important to repair refrigerant leak
when there is any leak found.

Inspection flow of refrigerant leak

Inspection Steps

Check the components of air-conditioner to see if there
occurs any refrigerant leak along the flow of refrigerant.

• To avoid an error in the detection of refrigerant leak,

make sure of there being no refrigerant vapor or
cigarette smoke around the vehicle before conducting
the inspection. Also, select a location where the
refrigerant vapor will not get blown off with wind.

• Inspection should be conducted chiefly on the pipe

connections and sections where a marked oil
contamination is found. When refrigerant is leaking,
oil inside is also leaking at the same time.

• It is possible to visually check the leak from inside the

cooling unit. Follow the method below when
checking. Remove the drain hose or resistor of the

cooling unit, and insert a leak detector to see if there
occurs any leak.

High Pressure Side

1. Discharger section of compressor.

2. Inlet/outlet section of condenser.

3. Inlet/outlet section of receiver driver.

4. Inlet section of cooling unit.

Low Pressure Side

1. Outlet section of cooling unit.

2. Intake section of compressor.

Step

Action

Yes

1. Evacuate the refrigerant system.

2. Charge the refrigerant.

Is there any refrigerant leak?

Repair refrigerant

system.

Go to Step 2.

1. Operate the compressor for more than 5 minutes to raise the

pressure on the high pressure side.

Is there any refrigerant leak at high pressure components?

Repair refrigerant

system.

Compressor

operation to be

confirmed.

Content .. 620 621 622 623 ..