Removal And Installation; Heater, Removal And Installation; Start-Up; Repair - Webasto Air Top Evo 40 Series Service Manual

8.7

Removal and Installation

Important: When the heater is installed it must not be dismantled.

8.7.1 Heater, Removal and Installation

8.7.1.1 Removal
1. Disconnect vehicle battery.
2. Pull cover off top shell as described in Section 9.2.1.1.
3. Disconnect wiring harness plug from control unit.
4. Disconnect cable to fuel pump at disconnection point.
5. If necessary, disconnect connection of cold and the hot air hose or hoses.
6. Disconnect connection for fuel inlet on heater.
7. Disconnect connections for combustion air inlet and exhaust outlet on heater.
8. Remove four nuts and locking washers from the heater.
9. Remove heater and discard base seal.
8.7.1.2 Installation
1. Move heater into installation position with new base seal and fasten with 4 nuts and lock washers (only use
genuine Webasto nuts).
2. Tighten the nuts to 6 +1 Nm.
3. Fasten connection for fuel inlet on heater.
4. Fasten connections for combustion air inlet and exhaust outlet on heater.
5. Reconnect fuel pump cable.
6. Connect the wiring harness plug to socket X7 on the control unit.
7. Fit the cover as described in Section 9.2.2.5 and secure it.
8. If necessary, fit cold and hot air hose or hoses and secure them.
9. Connect the battery.
10. Bleed the fuel supply system.

8.8 Start-up

After you have installed the heater, bleed the fuel supply system carefully.
NOTE: As a result of the low fuel consumption the heater must be switched on several times to fill the fuel line. During
test operation of the heater, all connections must be checked for leaks and firm seating. If the heater suffers a fault
during operation, troubleshooting must be located and remedied.
9.0

Repair

9.1

General information

This section describes the repair work that can be carried out on the Air Top Evo 40 / Air Top Evo 55 heater after it has
been removed from the vehicle. Any further dismantling will invalidate the warranty. Only use the spare parts from the
appropriate spare parts kits for assembling the heater.

9.1.1 Measures on dismantled components

IMPORTANT: All sealing elements between the dismantled components and the base seal must always be replaced
with new seals.
Air Top Evo 40 / Air Top Evo 55 Service Manual
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