Work On Vehicle - Webasto Thermo Pro 90 Workshop Manual

8 Servicing work
8 Servicing work
This section describes the servicing work that can be carried
out on the heater and its components while installed.
8.1 Work on heater
The power supply must always be disconnected at the
vehicle battery before carrying out any work on the heater,
or pull fuses F2 and F3. The power supply must not be
disconnected whilst the heater is operating or slowing down
as a result of the risk of the heater overheating and the
overheating protection thus being tripped. In case of repair
work on the heater, it must be completely removed. After
the heater and all coolant-carrying components have been
installed, the entire coolant system must be filled, bled and
checked for leaks with the specified system pressure (see
technical data) in accordance with the vehicle
manufacturer's instructions. The general installation
instructions and the vehicle-specific installation instructions
for the heater must be observed when carrying out repairs
which make it necessary to change the installation location.
Any coolant running off should be collected using an
appropriate container.
8.2

Work on vehicle

IMPORTANT
A temperature of 125 °C with the operating voltage
connected and the heater switched off must never be
exceeded in the area of the heater (e.g. during painting
work on the vehicle) (see technical data).
8.3 Test run of heater
WARNING
The heater may not be operated in closed rooms, such as
garages or workshops, without exhaust extraction, not even
with time preselection.
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NOTE
8.4 Checking work
In the interest of the operating safety of the heater, the
following service work must be carried out after or before
each heating season:
• Read out fault memory.
• Clean outside of heater (avoid penetration of water).
• Check electrical connections for contact corrosion and
firm seating.
• Check exhaust and combustion air lines for damage and
to ensure that they are clear.
• Check fuel line and filter for leaks.
• Check coolant circuit and circulation pump for leaks.
• Check hoses for cracks.
• Replace fuel filter if installed.
• Conduct operating test of heater as described in section
6.2.
8.5 Heater, removal and installation
8.5.1 Removal
1 Disconnect vehicle battery.
2 The control unit door need not be unlocked to remove
the vehicle specific wiring harness.
3 Pull off the wiring harness connector at the heater (not
by the cables)
4 De-pressurise coolant system.
All open plugs and connectors must be protected against
moisture and soiling.
5 Loosen hose clamps and pull coolant hoses off water
connection pieces of heater. The coolant hoses must be
secured against draining.
6 Loose combustion air pipe and exhaust pipe on heater
and pull off.
7 Loosen hose clamps and pull off fuel line. Seal off fuel
connection piece on heater and fuel line with suitable
sealing plugs etc.
8 Remove three screws and washers from the heater
bracket.
9 Remove heater.
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Thermo Pro 90
NOTE