Timberline Binar-5B-Compact User manual

1
Hydronic Heating System by Elwell Corp.
Binar-5B-Compact
Binar-5D-Compact
Service manual

1
1. Main Technical Characteristics 3
2. Safety Measures 4
3. Construction and Description of the Main Units of the Heater 4
4. Possible Heater Faults, their Root Causes & Troubleshooting Methods 4
Possible Faults & Replacement of Parts in the Timberline Heating System Components 5
5. Repair, and Replacement of Pre-heater Units 8
5.1 Replacement of the Glow Plug 9
5.2 Replacement of the Plug Screen 10
5.3 Replacement of the Flame Detector 11
5.4 Replacement of the Air Blower 13
5.5 Replacement of the Control Unit 14
5.6 Replacement of Temperature Sensors 15
5.7 Replacement of the Combustion Chamber 16
5.8 Replacement of the Fuel Pump 17
5.9 Replacement of the Pump 19
6. Domestic Water Heat Exchanger 20
7. Air Sensor 20
8. Water Solenoid Valve 21
9. Heating Fans 21
10. Timberline Tank 22
11. Pinout and Replacement of the Control Box 23
12. Touch Panel 24
13. Purging the System 24
14. Pre-heater Check after Installation 25
15. Manufacturer’s Warranty 25
Warranty Part Replacement Labor Time 26
Contents

2
Introduction
This Service Manual (“SM”) is intended for use by the
maintenance personnel servicing Binar-5B-Compact and
Binar-5D-Compact hydronic pre-heaters (“pre-heaters”).
This manual contains techniques for troubleshooting, as well as
for determining whether various units and parts are in good con-
dition or need to be replaced. It also contains general technical
specications and descriptions of the units and their purpose as
parts of the pre-heater, as well as tips for their maintenance and
particular features of the various models.
The operating manual and the catalogue of parts and assemblies
must be used alongside this manual during the repair of
the pre-heater.
This Service Manual may not include information about minor
design alterations made by the manufacturer after the
publication date of this SM.
Binar-5B-Compact, Binar-5D-Compact
Service Manual

3
1. Main Technical Characteristics
See Table 1 for the main technical characteristics of the pre-heater.
The technical characteristics include a ±10% tolerance and are specied for
operation at the rated power supply voltage and air temperature
of 68°F.
Table 1.
Parameter description Model
Binar-5B-Compact Binar-5D-Compact
Heat capacity, BTU 17,060
Rated power voltage, V 12
Operating power voltage
range, V 9.5 - 16
Fuel type Gasoline Diesel
Fuel consumption (max.), GPH 0.18 0.21
Heat transfer agent DEX-Cool Antifreeze
Electric power consumed,
pump included, (max.), W 45 45
Power consumed at startup
(100 s), W 65 65
Maximum liquid heating tem-
perature, °F +194
Ignition mode Manual or Automatic
Preheater weight in full con-
guration, lbs, max. 19.8

4
2. Safety Measures
2.1 Relevant workforce safety rules
must be observed during the
repair.
2.2 Failure to observe pre-heater
operation instructions may
cause re.
2.3 A workplace must be equipped
with re-ghting means.
2.4 Do not refuel an operating
pre-heater.
2.4 Do not operate the pre-heater
with the fuel system poorly
sealed.
2.6 Do not use the pre-heater with
in conned spaces and in
poorly ventilated rooms.
2.7 Do not switch off power to the
pre-heater before the purging
cycle ends.
2.8 Where ame appears at the
exhaust nozzle, turn the heater
off and repair the fault after
it stops.
3. Construction & Description of the Main Units of the Heater
3.1 The construction, main units
and parts of the pre-heater are
shown in the CPA (catalogue of
parts and assemblies).
3.2 The electric circuit diagram is
shown in the operating manual.
4. Possible Heater Faults, their Root Causes and Trouble-
shooting Methods
A fault may occur during operation of
the pre- heater. A fault may be diag-
nosed by a malfunction code indicated
on the control panel, as described in
Table 2.
There may be faults that are not identi-
able via the control unit, such as loss
of sealing in the heat exchanger (burn-
ing out) or loss of heat capacity due to
fouling of the inner surface of the heat
exchanger. The above faults may be
diagnosed by visual inspection.
Caution: Do not operate the pre-heater
with a poorly sealed heat exchanger.
During pre-heater operation, its sep-
arate units may fail to operate, and
some of them may be replaced without
removing the entire pre-heater from
the vehicle. Such units include, for
example, the fuel pump or the
control panel.
A PC (laptop) with a USB socket may be
used for diagnosing the condition of
the pre-heater units. To do so, connect
the PC to the pre-heater in place of the
control panel using the USB adapter
(supplied separately).

5
Codes Malfunction
Description
Malfunction
Root Cause
Recommended Trouble-
shooting Methods
01
Overheating
(upper tem-
perature limit
exceeded).
Heat exchanger tem-
perature near the tem-
perature sensor
> 110ºС.
1. Perform complete test
of the
uid loop.
2. Check the pump;
replace
if necessary.
3. Check overheating
sensor and temperature
sensor; replace
if necessary.
02 Potential over-
heating
Exceedingly high differ-
ence in temperatures
measured by the over-
heating sensor and the
temperature sensor.
03 Temperature
sensor 1 fault Short or open circuit in
the
electric wiring.
Replace both sensors
(section 5.6).
04 Temperature
sensor 2 fault
05 Flame detector
fault
Short circuit to frame
or open circuit in the
detector wiring.
Check the ame detector
(see 5.3) and replace, if
necessary.
06
Control unit tem-
perature sensor
fault
The temperature sensor
is faulty (located in the
control unit,
cannot be replaced)
Replace the control unit
(section 5.5).
Table 2.
07
Flame blowoff
in “LOW-DUTY”
mode
Poor conditions for com-
bustion. Lack of fuel/air,
the heat exchanger is
fouled, the exhaust pipe
is clogged.
Check the air intake, the
gas exhaust pipeline, and
fuel supply, resolve the
faults and replace the fuel
pump or the ame
detector if necessary.
08
Flame blowoff
in “FULL-DUTY”
mode
09 Glow plug fault Short or open circuit,
control unit fault
Test glow plug. Replace
if necessary. Check the
control unit; replace if
necessary (see 5.1).
Possible Faults and Replacement of Parts in the Timberline
Heating System Components

6
10
Air blower fault.
Speed lower
than rated
Foreign particles
obstruct spinner move-
ment, or the spinner hits
the air blower cover.
Check the electric wiring.
Check the AB for dirt.
Correct the fault; replace
the air blower if neces-
sary (see section 5.4).
11
Overheating
(heating rate is
too high)
The temperature
sensors heat too rapidly.
1. Check the entire liquid
circuit for any possible
air blocks upstream of
the pump preventing the
coolant to be pumped
through the
heating element.
2. Check coolant
3. Check the pump;
replace
if necessary.
12 Shutdown due to
overvoltage.
Power supply voltage >
16 V
Test voltage at connector
ХS2 on the heater. Test
the battery, the vehicle
voltage regulator, and
power supply wiring.
13 All attempts to
start failed
Failure to ignite
(after two attempts)
Check the fuel line, the
fuel pump, and the air
blower. Check the
exhaust pipe.
Check the combustion
chamber, clean the
Ø2.8 mm opening if
necessary (see 5.7 and
5.2)
14 Pump fault
Short or open circuit
of current-conducting
parts, contaminated
pumping elements.
Check short circuit and
discontinuity of circula-
tion pump wiring; check
the pump; replace if
necessary.
Clean the pumping
elements of the pump.
(section 5.9).

7
27 Air blower fault.
The motor does not
rotate
(movement is possibly
obstructed)
Check the AB for me-
chanical obstruction of its
rotation.
Test wiring, the air pump,
and the control unit;
replace if necessary.
28 Air blower fault.
The motor rotates un-
controllably (possible
fault in the 5 V power
supply to the
control unit).
15 Shutdown due to
undervoltage
Power supply voltage <
9.5 V
Test voltage at connector
ХS2 on the heater. Test
the battery, the vehicle
voltage regulator, and
power supply wiring.
16 Ventilation time
exceeded
The ame sensor is not
cooled down by purg-
ing sufciently.
Check the air intake and
the gas exhaust pipe.
Check the ame detec-
tor; replace if necessary.
17 Fuel pump fault
(short circuit)
Short circuit in the fuel
pump wiring
Test the fuel pump power
wiring for short circuit,
replace if necessary.
21
Flame blow off
in “WARMUP”
mode
Poor conditions for com-
bustion. Lack of fuel/air,
the heat
exchanger is fouled, the
exhaust pipe is clogged.
Check the air intake, the
gas exhaust pipeline, and
fuel supply, resolve the
faults and replace the
fuel pump and the ame
detector if necessary.
22 Fuel pump fault
(open circuit)
Open circuit in the fuel
pump wiring
Test the fuel pump power
wiring for breaks, replace
if necessary.
29
All ignition
attempts
failed with the
pre-heater in
operation
Ignition has been tried
more than 4 times.
Check the fuel system.
Check the security of the
fuel line clamps, the seal
of the fuel line and the
fuel pump nozzle, and
the fuel pump capacity.
41
External Air Tem-
perature Sensor
Fault
Open circuit in the
wiring
Check the wire harness
for any cut or unplugged
wiring.
42
External Air Tem-
perature Sensor
Fault
Short circuit in the
wiring
Check the wire harness
for any cut or miss pinned
wiring.

8
43 Heat Exchanger
Sensor Fault
Open circuit in the
wiring
Check the wire harness
for any cut or unplugged
wiring.
44 Heat Exchanger
Sensor Fault
Short circuit in the
wiring
Check the wire harness
for any cut or miss pinned
wiring.
45
Tank Tempera-
ture
Sensor Fault
Open circuit in the
wiring
Check the wire harness
for any cut or unplugged
wiring.
46
Tank Tempera-
ture
Sensor Fault
Short circuit in the
wiring
Check the wire harness
for any cut or miss pinned
wiring.
47
No communi-
cation between
the control unit
and the control
panel.
Short or open circuit in
the wiring
Check circuits and
terminals
48
No communica-
tion between the
control unit and
the heater.
Short or open circuit in
the wiring
Check circuits and
terminals
5. Purpose, Repair, and Replacement of Pre-heater Units
The main units of the heater are shown in the CPA (catalogue of parts and assem-
blies). Binar-5B-Compact and Binar-5D-Compact pre-heaters differ in terms of con-
trol units, fuel pumps, and combustion chambers. Partial disassembly of the heater
is required to check the condition of heater units or to replace them.
Blower Air Blower Socket
Harness Connection
Sockets
Heater Unit

9
The glow plug ensures ignition of the
air-fuel mixture as the pre-heater starts.
To check the operation of the plug and
replace the plug:
• Disconnect the control unit
connectors from the harness
• Remove the screws fastening the
control unit to the pre-heater
housing, remove the control unit
from the pre-heater, thus providing
the required access
• Disconnect the plug outputs from
the control unit
• Unscrew the plug
• Check plug operation by connect-
ing its terminals to a 12 V battery:
the plug must glow bright red
(temperature approx. 1000°С)
from its tip to about its middle part.
After 30 seconds, measure current
consumption. Current consumption
must be within 3 to 5.2 А. Continue
the test for no more than 90 s. Wait
no less than 180 s before repeating
the test
• If the plug is fault-free, check its
operation from the control unit.
To do that, clean and tighten plug
terminals and then, without screw-
ing the plug into the combustion
chamber, connect its terminals to
the terminals of the control unit.
Connect the control unit termi-
nals to the harness and turn the
pre-heater on. The plug must
gradually heat up to the same tem-
perature as when connected to the
battery. If it is not the case, replace
the control unit.
If the heating element works fault-
lessly after the replacement of the
control unit, the one removed must
be deemed faulty and should
be replaced.
If the plug does not meet at least one
of the above requirements, replace it.
Replace the plug in the reverse order.
Prior to mounting the plug, install the
washer and the bushing (g. 2) on it
and only then screw the plug into the
combustion chamber nozzle.
Note: For a gasoline-operated pre-
heater, install the screen onto the plug
as well (Fig. 2а).
Caution: Do not use voltage above
12 V to check the plug!
5.1 Purpose, Check, and Replacement of the Glow Plug
Glow Washer Sleeve
Fig. 2. Plug with an installation kit
(for a diesel pre-heater)
Fig. 2a. Plug with an installation kit
(for a gasoline pre-heater)
Screen

10
A glow plug screen is installed to
equalize the fuel supply to the
combustion chamber.
When changing or checking the plug,
check the screen for fouling or clog-
ging as well. If the screen is fouled,
replace it. Install the screen into the
diesel chamber nozzle using the man-
drel, as shown on Fig. 3 and 4.
For a gasoline chamber, the screen is
installed onto the plug (Fig. 2a) and
then screwed all the way in. To prevent
clogging, clean a Ø2.8 mm opening
located on the lateral cylindrical
surface of the nozzle before installing
the screen into the nozzle
The screen must be installed fully
tensioned. Where it is installed without
having complete contact with the end
face, the pre-heater may fail to launch.
When installing the screen for a Bi-
nar- 5B-Compact (gasoline-operated),
visually inspect the screen (Fig. 3а)
for burrs (Fig. 3b). Carefully cut off any
found burrs with scissors. Install the
screen onto the plug as shown on
Fig. 2a and screw it into the
combustion chamber.
5.2 Purpose, Check, and Replacement of the Plug Screen
Fig. 3а.
Binar-5B-Compact Screen
Fig. 3b.
A burr on the screen
Fig. 3. Installing the screen into
combustion chamber nozzle
Fig. 4. Mandrel sizes

11
5.3 Purpose, Dismounting, and Replacement of the Flame Detector
The ame detector (Fig. 5) is used
to detect ame in the combustion
chamber. It is comprised of a pipe
with a thermocouple with two
outputs inside.
Check the ame detector if malfunc-
tions described in Table 2 occur.
If the fault appears during the pre-
heater startup:
Disconnect the control unit connec-
tors from the harness
Remove the screws fastening the
control unit to the air blower housing
Disconnect the LED wires from the
control unit
Check the ame detector for open
circuit with a multimeter. An open
circuit means the ame detector
is faulty
Check the insulation resistance
between the outputs and the FD
housing. It must not be lower than
100 MΩ at 100 V. Measure the resis-
tance at 15–35ºС and relative humid-
ity not above 80%. If the insulation
resistance does not meet this
criterion, replace the FD.
If an error appears during the heating
element operation, there is either a
crack in the weld of the FD thermo-
couple (i.e. the circuit is open), or
the polarity of the FD connection is
reversed. The fault may be revealed
using two methods:
Method 1.
Remove the FD from the housing
(Fig. 6), connect the terminals of the
FD to a multimeter (at the tempera-
ture measuring terminals), and heat
up the FD, for instance, with a lighter.
The temperature must increase
gradually. If it increases in surges or
goes down to the initial value, the FD
is damaged. In this case, however,
the circuit may close after the FD
has cooled down.
Fig. 5. Flame detector
Fig. 6. Flame detector
Flame Detector
Washer

12
5.3 Purpose, Dismounting, and Replacement of the Flame Detector
Continued
Method 2.
Remove the FD from the housing and
measure the voltage at outputs of the
FD that is being heated up. When the
FD housing is heated up to +100°С
(boiling water temperature), its outputs
must provide voltage at about 3 mV.
The positive pole is marked with a red
tube and the negative with a black one.
In case of an open circuit, the FD
must be deemed faulty and should
be replaced.
To check the FD channel of the control
unit, install a jumper in place of the FD
(Fig. 6a). Connect the control unit sock-
ets to the harness. If a malfunction code
related to the FD (malfunction code 5)
does not appear after the pre-heater
launch, the CU is fault-free. Remove the
jumper and connect a fault-free FD.
Replace the FD in the reverse order.
Where the fault persists, check the
polarity of the FD connection (the wire
with a black mark must be connected
with the CU connector marked with a
black dot, as shown in Fig. 6b). An error
in the placement of the marking on the
FD wires is also possible. To remedy this
situation, swap the FD terminals in the
control unit socket.
Fig. 6a.
Jumper
Fig. 6b.
FD to CU connection

13
5.4 Purpose, Dismounting, and Replacement of the Air Blower
The air blower (Fig. 7) consists of an
electric motor with a scroll housing
attached. A spinner is installed on the
motor shaft. When the motor shaft is
revolving, the spinner and the scroll
generate air ow going to the combus-
tion chamber to ensure burning as well
as to blow off the combustion chamber
to cool it down and remove residual
fuel and moisture before the beginning
and the end of the burning process.
When the motor or the spinner are
faulty (the spinner hits the scroll or the
cover), locate the cause of hitting and
remove it and, if impossible, completely
replace the air blower with a new one.
To identify the fault correctly:
Check the cleanliness of the air blower
terminals connected to the control unit.
Remove the air blower cover and check
for foreign particles on the spinner or if
the scroll hits the cover during rotation.
Dismount the air blower in the
following order:
• Ensure access to the air blower
(if necessary, remove it from the
vehicle)
• Disconnect the air blower socket
• Remove the screws fastening the air
blower to the air blower housing
• Dismount the air blower
• Remove the screws fastening the
cover to the air blower housing
Visually inspect the spinner for for-
eign particles, clean if necessary. If the
foreign particles are hard to clear away,
remove the spinner from the motor
shaft. Remove the lock washer and dis-
mount the spinner. Pay attention to the
adjustment washers under the spinner.
Make sure not to lose them! Clean off all
foreign particles and install the spinner
back onto the motor shaft (with a new
lock washer).
If the spinner hits the cover, grind the
touch points on the spinner and the
cover with ne abrasive paper. Screw
the cover in and check whether the
spinner hits the cover once again.
Mount the air blower in the reverse
order. Visually check the condition of
O-rings.
Fig. 7. Air blower
Air Blower
O-rings

14
The CU (Fig. 8) performs the
following functions:
1. Initial diagnostics (functional check)
of pre-heater units at startup.
2. Functional diagnostics of pre-heater
units during operation.
3. Sending information to the control
panel.
4. Pre-heater startup.
5. Pre-heater shutdown:
- Following a signal from the
panel, after a set time period
- Upon failure of one of the
controlled units
- Upon exceeding allowable
limits of the temperature
and voltage
- Upon ame blow off in the
combustion chamber
While troubleshooting the control unit,
rst ensure all parts of the pre-heater,
as well as the control panel, are in
working order. If the pre-heater works
faultlessly after the replacement of the
control unit, the one removed must be
deemed faulty and should be replaced.
To dismount the control unit:
• Disconnect the control unit
connectors from the harness
• Disconnect the air blower socket
• Remove the screws fastening
the control unit to the air
blower housing
• Disconnect the plug wires from the
control unit
• Disconnect the FD wires from the
control unit
• Remove the fastening clamp of the
temperature sensors
• Remove the control unit
Reinstall the control unit in the
reverse order.
5.5 Purpose, Dismounting, and Replacement of the Control Unit
1.
2.
5.
3.
4.
Fig. 8. Control unit
1. Plug Connection Sockets
2. Flame Detector Sockets
3. Air Blower Sockets
4. Clamp
5. Temperature Sensors

15
5.6 Purpose, Dismounting, and Replacement of Temperature Sensors
The overheating and temperature
sensors (Fig. 8 and 9) monitor the
temperatures of the heat exchanger.
If the temperature exceeds 110°С,
the control unit shuts the pre-heater
down with malfunction code 01; if
the coolant circulation is insufcient,
overheating may be caused by a large
temperature gradient between the
inlet and outlet (malfunction code
02) or by rapid heating of the sen-
sors (malfunction code 11). If failures
are caused by the sensors and not
by quality of coolant or the pump,
replace both sensors.
To dismount and replace the sensors:
• Remove the control unit (see 5.5).
• Cut the wires between the tem-
perature sensors and the control
unit. Make sure to remember
the position of the wires
marked black.
• Strip the wire ends and solder
new sensors to them. Cover the
connection spots with a heat-
shrink tube or a duct tape.
Reinstall the control unit in the
reverse order. Fig. 9. Temperature sensors.
Fig. 8. Control unit
Temperature Sensors

16
The evaporative type combustion
chamber is used for creating and
burning the air-fuel mixture
Symptoms of combustion chamber
faults are: a failure to start the heater
(provided other parts are fault-free),
a burnt out housing or inner parts of
the chamber.
A faulty combustion chamber must be
replaced. Dismount the combustion
chamber in the following order:
• Remove the heater from
the vehicle
• Disconnect the air blower socket
• Remove the control unit (see 5.5)
• Remove the screws fastening
the air blower to the air
blower housing
• Dismount the air blower
• Unscrew the plug
• Remove the screws fastening the
combustion chamber cover to the
heating element
• Remove the combustion
chamber cover
• Remove the combustion chamber
xing screws
• Remove the combustion chamber.
Reinstall the combustion chamber in
the reverse order.
While replacing the combustion
chamber, inspect the heat exchanger.
Heat exchanger faults include a loss
of heat conductivity, an increased
temperature of exhaust gases
(> 500ºС), burnt-out heat exchang-
er walls. Such faults are caused by
deposits of fuel combustion products
(soot) onto the inner walls and ns
of the heat exchanger as a result of
using low quality fuel.
After removing the combustion
chamber, clear the inner part of the
heat exchanger of burnt deposits and
soot (if any).
5.7 Purpose, Dismounting, and Replacement of the Combustion
Chamber
Fig. 10. Combustion Chamber

17
5.8 Purpose, Troubleshooting, Dismounting, and Replacement
of the Fuel Pump
5.8.1
The fuel pump (Fig. 11) is used
for metered fuel supply to the
combustion chamber.
Main characteristics of the fuel pump:
• Rated supply voltage 12 V,
• Coil resistance 6.0 Ω.
Possible pre-heater fuel pump faults:
• Fuel is not supplied to the fuel
pipe of the heater during launch,
and a characteristic knocking
noise from the fuel pump
is absent
• The fuel pump operates, but no
fuel is supplied to the fuel pipe of
the pre-heater
• Combustion stops when the
pre-heater is switched to the
“max.” operation mode, which
means the fuel pump does not
provide the required capacity
5.8.2
To repair faults and determine the
capacity of the fuel pump:
• Before troubleshooting, rst check
the presence and quality of fuel in
the tank
• Check the condition of the wiring
and connectors
• Check whether the fuel pump
launches when the pre-heater is
launched and emits the charac-
teristic noise of the piston moving
inside the pump
• Check the seal of the fuel line over
its entire length from the tank to
the fuel pump and from the fuel
pump to the heater
You may dismount the fuel pump and
shake it to release the piston jammed
inside the pump after long storage
or failure to observe the preventive
maintenance specied in the
operating manual.
Fig. 11. Fuel pump

18
5.8 Purpose, Troubleshooting, Dismounting, and Replacement of the
Fuel Pump Continued
The pre-heaters are supplied with two
pump types:
• Diesel pumps (manufactured by
Advers OOO);
• Gasoline pumps (manufactured by
Thomas Magnete).
In case of fault in a Thomas Magnete
fuel pump, it must be replaced.
In case of a fault in an Advers OOO
fuel pump, do the following:
• Check whether the lter is clean.
Remove the inlet nozzle of the
fuel pump and visually inspect the
lter. Flush it with petrol and purge
with compressed air, if necessary.
• Check air tightness of the connec-
tion between the fuel pump body
and the inlet nozzle (Fig. 11). To
check it, use air under pressure
of max. 1 kg-f/cm2. Supply the air
from the inlet after plugging the
outlet nozzle. If the connection
is not airtight, replace the nozzle
gasket (Fig. 11).
If all of the above faults are repaired,
check the capacity of the fuel pump.
The fuel pump capacity must be
4.4-3%+5% ml for diesel and 4.0
-3%+5% ml for gasoline per 100 cy-
cles. If the capacity is below or above
that specied, replace the fuel pump.
To dismount and reinstall the
fuel pump:
• Loosen the clamps and dis-
connect the fuel lines from fuel
pump nozzles
• Disconnect the wiring from the
fuel pump
• Loosen the screw on the clamp
and remove the fuel pump
Reinstall the fuel pump in the
reverse order.
Fig. 11. Fuel pump

19
5.9 Purpose, Troubleshooting, Dismounting, & Replacement of
the Pump
The electric motor and the pump
(Fig. 12) are used to circulate coolant
across the vehicle engine/cabin heat-
ing systems.
The pump may fail to operate for the
following reasons:
• Poor coolant quality (frozen
coolant)
• Foreign particles inside the
liquid circuit
• Short or open circuit in the
electric wiring
• Wear on the working parts of
the pump.
If the coolant is frozen (has turned
into a snow-like mass) inside the
pump, the pump may continue to
operate but will not be able to circu-
late any coolant. Unfreeze the pump
and replace the coolant with that of
better quality.
Where there are foreign particles
(such as ne chippings or sawdust)
inside the liquid circuit, they may
obstruct pump operation. A clear
symptom of a contaminated pump
is poor circulation of the coolant.
To clean the pump, partially disassem-
ble it in the following order:
• Remove the pump from
the vehicle
• Remove the four screws and
remove the cover
• Clean the cover and the spinner
of foreign particles
• Reinstall the cover and check the
pump operation
If the pump does not turn on, check
the wiring.
If the wiring is not visibly damaged,
connect an electric source at the
pump operating voltage directly to
the pump terminals for a short
period. If the pump starts, it is fault-
free. Check the wiring with
a multimeter.
Fig. 12. Electric motor with a pump