Opel Frontera UBS. Manual - part 11

00 – 16 SERVICE INFORMATION

TROUBLE

POSSIBLE CAUSE

CORRECTION

HEATING CYCLE TROUBLESHOOTING

No heating or
Insufficient heating.

•

Refer to “FAN CONTROL KNOB (FAN
SWITCH)” Troubleshooting.

•

Check the engine coolant temperature
after warming up the engine and check
the thermostat. Replace as necessary.

•

Add engine coolant as required.

•

Check if the water hose to the heater
core is clogged, collapsed or twisted.
Repair or replace as necessary.

•

Check water pump function. Repair or
replace as necessary.

•

Clean or replace as necessary.

•

Repair the temperature control link unit
or mode doors.

•

Repair or adjust the control cables.

•

Repair or replace as necessary.

•

Refer to “CERAMIC HEATER”
Troubleshooting.

•

Repair.

•

Repair.

•

Repair.

•

Adjust.

1.

Blower motor does not run, or
runs improperly.

2.

Engine coolant temperature is
low.

3.

Insufficient engine coolant.

4.

Circulation volume of engine
coolant is insufficient.

5.

Heater core clogged or
collapsed.

6.

The heater core is not provided
with air sent from the blower
motor.

7.

Duct connections defective or
unsealing.

8.

Ceramic heater defective.

1.

Cable attaching clip is not
correct.

2.

Link unit of heater unit or
blower assembly defective.

1.

Link unit of heater unit or
blower assembly defective

2.

Control cable is not adjusted.

Control knob moves
but mode door does
not operate.

The mode door
cannot be set to the
mode selected.

SERVICE INFORMATION  00 – 17

FAN CONTROL KNOB (FAN SWITCH)

Current flows to the blower motor through the
Heater & A/C relay (B-36) to activate the rotation of
the blower motor by turning “ON” the fan control

knob (fan switch). Blower motor speed is controlled
in stages by the resistor, by operating the switch
from “LOW” to “HIGH.”

1

2

3

4

B-36

B-1

B-2

1

2

3

4

5

6

1

2

1

2

3

4

5

6

I-41

B-5

I-18

1

2

B-36

RELAY;
HEATER & AC

C-19
25A

BLOWER

2

3

6

4

1

6

3

5

2

1

M

BLOWER
MOTOR

2

1

RHD

OFF

B-5

B-5

I-18

BLOWER
RESISTOR

FAN SW.

I-41

B-1

B-2

(LHD) BODY-RH

(RHD) BODY-LH

D08RY00167

00 – 18 SERVICE INFORMATION

BLOWER MOTOR DOES NOT RUN

•

IS NO. C-19 (25A) FUSE OK?

•

IS BLOWER RELAY (B-36) OK?

YES

NO

REPLACE

NO

REPLACE

NO

REPLACE

NO

REPLACE CONTROL LEVER ASSEMBLY

NO

REPLACE

NO

OPEN CIRCUIT BETWEEN NO. C-19
(25A) FUSE AND NO. B5-1 (NO. B5-2; 
RHD)

YES

•

IS RESISTOR OK?

YES

•

IS FAN CONTROL KNOB (FAN SWITCH) OK?

YES

•

IS BLOWER MOTOR OK?

YES

•

TURN THE IGNITION SWITCH “ON” (ENGINE IS

RUNNING)

•

FAN CONTROL KNOB (FAN SWITCH) “ON”

•

CHECK TO SEE IF BATTERY VOLTAGE IS PRESENT

AT CHASSIS SIDE CONNECTOR TERMINAL NO. B5-1

(NO. B5-2; RHD)

YES

POOR GROUND OR OPEN CIRCUIT EITHER BETWEEN

CHASSIS SIDE CONNECTOR TERMINAL NO. B5-2

(NO. B5-1; RHD) AND NO. I-41-2 OR NO. I18-1 AND BODY

GROUND NO. B-2 (NO. B-1; RHD)

SERVICE INFORMATION  00 – 19

BLOWER MOTOR DOES NOT RUN IN CERTAIN

POSITION

A

1 : (LOW)

BLOWER MOTOR DOES

B

2 : (MEDIUM LOW)

NOT RUN AT

C

3 : (MEDIUM HI)          POSITION

D

4 : (HIGH)

* CHECKING IS PERFORMED ONLY WHEN IN

THE MALFUNCTION MODE.

•

IS RESISTOR OK?

YES

•

IS FAN CONTROL KNOB (FAN SWITCH) OK?

YES

A

CONDITION:

•

OPEN CIRCUIT BETWEEN CHASSIS SIDE CONNECTOR
TERMINAL NO. I41-1 AND NO. I18-2

B

CONDITION:

•

OPEN CIRCUIT BETWEEN CHASSIS SIDE CONNECTOR
TERMINAL NO. I41-4 AND NO. I18-5

C

CONDITION:

•

OPEN CIRCUIT BETWEEN CHASSIS SIDE CONNECTOR
TERMINAL NO. I41-6 AND NO. I18-3

D

CONDITION:

•

OPEN CIRCUIT BETWEEN CHASSIS SIDE CONNECTOR
TERMINAL NO. I41-3 AND NO. I18-6

NO

REPLACE

NO

REPLACE CONTROL LEVER
ASSEMBLY

BLOWER MOTOR DOES NOT STOP AT “OFF”

POSITION

•

IS FAN CONTROL KNOB (FAN SWITCH) OK?

YES

SHORT CIRCUIT BETWEEN CHASSIS SIDE
CONNECTOR TERMINAL

•

NO. B5-2 (NO. B5-1 : RHD) AND NO. I41-2

(OR)

•

NO. I41-3 AND NO. I18-6

(OR)

•

NO. I41-6 AND NO. I18-3

(OR)

•

NO. I41-4 AND NO. I18-5

(OR)

•

NO. I41-1 AND NO. I18-2

NO

REPLACE CONTROL LEVER
ASSEMBLY