Opel Frontera UE. Manual - part 18

1A–44

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

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)/ Engine
Control Module (ECM;L4-2.2L) 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

Is the fuse No. F-5 normal?

—

Go to Step 2

Replace the

fuse

Are the relay No.X-6 (heater relay). No.X-5
(Thermostat relay) and No.X-4 (compressor relay)
normal?

—

Go to Step 3

Replace the

relay

Is pressure switch normal?

—

Go to Step 4

Place the

pressure

switch.

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

—

Go to Step 5

Replace the A/

C switch and

fan control

switch

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

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

—

Varify repair

—

Is there continuity between harness side connector
terminal No.X4-1 and No.E3-1?

—

Go to Step 9

Go to Step 8

Repair an open circuit between terminal No.X4-1 and
No.E3-1.
Is the action complete?

—

Go to Step 7

—

Is the battery voltage applied between harness side
connector terminal No.X4-2 and ground, No.X4-5 and
ground?

Approx.12V

Go to Step 11

Go to Step 10

Repair and open circuit between terminal No.X4-2 and
No.F-5 fuse, No.X4-5 and No.F-5 fuse.
Is the action complete?

—

Go to Step 9

—

Is there continuity between harness side connector
terminal No.X4-4 and No.C1-B14?

—

Go to Step 13

Go to Step 12

Repair an open circuit between terminal No.X4-4 and
No.C1-B14.
Is the action complete?

—

Go to Step 11

—

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

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

—

Go to Step 13

—

Is the battery voltage applied between harness side
connector terminal No.B4-3 and ground?

Approx.12V

Go to Step 17

Go to Step 16

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).

875RX010

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

Content .. 16 17 18 19 ..