801
Thermo G
8 Repair
8
Removal and installation of
components and of the heater
8.1
General
The general safety regulations according to Chapter 1
must be observed.
Prior to removing components, disconnect the heater
from the vehicle electrical system.
ATTENTION:
Sealing elements between disassembled compo-
nents must always be replaced.
This does not apply for the gasket ring of the
temperature sensor because it is firmly attached.
Screws with thread coating (screw locking) must be
replaced.
NOTE:
If components are disassembled to a degree not covered
in this workshop manual, any warranty claim shall be
voided.
Only genuine Valeo spare parts should be used.
Basically, the access to the individual components of the
heater is for the purposes of testing or replacement as
follows:
After the removal of the hood, the control device and the
fan motor (electric test) are accessible.
By removal of the burner head access to the following
components is possible:
•
combustion chamber
•
flame pipe
•
heat exchanger
•
ignition electrodes
The separation of the fan housing from the mixing
chamber is necessary for the examination or replacement
of the following components:
•
fan motor
•
fan wheel
•
ZF-module
8.2
Removal and installation of the
temperature sensor with integrated
overheating protection
Prior to removing the temperature sensor, the over-
pressure in the cooling system must be released (i.e.
by opening the radiator cap). Observe the risk of inju-
ries due to increased coolant temperature. Possibly
let heater additionally cool down and have collecting
container ready for discharged coolant.
Removal
1. Disconnect the heater from the vehicle electrical
system and from the circulating pump as needed.
2. Disconnect the temperature sensor plug (5, Fig. 802).
ATTENTION:
The temperature sensor is positioned directly in
the coolant circuit. To prevent coolant from
escaping as far as possible, the coolant hoses are
to be closed with pinch-off pliers (331457).
3. Unscrew and remove temperature sensor (1, Fig.
801). Collect the escaping coolant.
Installation
1. Manually screw temperature sensor (1, Fig. 801) into
the coolant outlet (2).
2. Tighten temperature sensor (1) with 8 Nm ± 0.5 Nm.
3. Connect temperature sensor plug (5, Fig. 802).
4. Connect the heater with the vehicle electrical system
and the circulating pump as needed.
Danger to life and health!
Warning!
Risc of electric shock!
Warnung!
Fig. 801 temperature sensor removal and installation
Risk of scalds!
CAUTION!
1
2
1
Temperature sensor
2
Coolant outlet
