Opel Frontera UE. Manual - part 621

 

  Index      Opel     Opel Frontera UE - service repair manual 1999-2001 year

 

Search            

 

 

 

 

 

 

 

 

 

Content   ..  619  620  621  622   ..

 

 

Opel Frontera UE. Manual - part 621

 

 

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–41

Condition

Possible cause

Correction

Discharge (High Gauge) Pressure
Abnormally High

Condenser clogged or dirty.

Clean the condenser fins

Cooling fan does not operate
properly.

Check the cooling fan operation.

Discharge (High Gauge) Pressure
Abnormally High.
Insufficient cooling.

Excessive refrigerant in system.

Discharge  and  recover  refrigerant.

Recharge to specified amount.

Discharge (High Gauge) Pressure
Abnormally High.
High pressure gauge drop.     (After
stopping A/C, the pressure drops
approx. 196kPa (28psi) quickly)

Air in system.

Evacuate  and  charge  refrigerant
system.

Discharge (High Gauge) Pressure
Abnormally Low.
Insufficient cooling

Insufficient refrigerant in system.

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

Discharge (High Gauge) Pressure
Abnormally Low.
Low pressure gauge indicates
vacuum.

Clogged or defective expansion
valve.

Replace the expansion valve.

Discharge (High Gauge) Pressure
Abnormally Low.
Frost or dew on refrigerant line
before and after the receiver/drier or
expansion valve, and low pressure
gauge indicates vacuum.

Restriction caused by debris or
moisture in the receiver/drier.

Check system for restriction and
replace the receiver/drier.

Discharge (High Gauge) Pressure
Abnormally Low.
High and low pressure gauge
balanced quickly. (After turned off A/
C)

Compressor seal defective

Repair or replace the compressor.

Poor compression due to a defective
compressor gasket.

Repair or replace the compressor.

Suction (Low Gauge) Pressure
Abnormally High.
Low pressure gauge (Low pressure
gauge is lowered after condenser is
cooled by water.)

Excessive refrigerant in system.

Discharge  and  recover  refrigerant
Recharge to specified amount.

Suction (Low Gauge) Pressure
Abnormally High.
Low pressure hose temperature.
(Low pressure hose temperature
around the compressor refrigerant
line connector is lower than around
evaporator.)

Unsatisfactory valve operation due
to  defective temperature sensor of
expansion valve.

Replace the expansion valve.

Expansion valve opens too long.

Replace the expansion valve.

Suction (Low Gauge) Pressure
Abnormally High.
High and low pressure gauge
balanced quickly. (After turned off A/
C)

Compressor gasket is defective.

Repair or replace the compressor.

Suction (Low Gauge) Pressure
Abnormally Low.
Insufficient cooling.

Insufficient refrigerant in system.

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

Suction (Low Gauge) Pressure
Abnormally Low.
Frost on the expansion valve inlet
line

Expansion valve clogged.

Replace the expansion valve.

1A–42

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

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

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–43

Magnetic Clutch Diagnosis

D08RX249

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.

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

No

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

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

11 

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

Go to Step 13

Go to Step 12

12 

Repair an open circuit between terminal No.X4-4 and
No.C1-B14.
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.B4-3 and ground?

Approx.12V

Go to Step 17

Go to Step 16

 

 

 

 

 

 

 

Content   ..  619  620  621  622   ..