9 Repair Thermo 90
904
9.2.3 Replacement of Temperature Limiter
9.2.3.1 Removal
NOTE
Perform the following procedure only when the tempera-
ture limiter needs replacement.
A functional check has to be performed when the temper-
ature limiter is installed.
1. Remove heater (see 8.7.1.1).
2. Disconnect electrical co
nnections (see 9.2.1.1).
3. Remove clamp (2, Fig. 903) and withdraw protective
ca
p (1).
4. Using screw driver, lever off retaining clip an
d remove
temperature limiter (3).
5. Perform procedures on components after
dis
assembly (see 9.1.1).
NOTE
Whenever the temperature limiter is removed, it must be
re
newed.
9.2.3.2 Installation
CAUTION
Wrong installation will caus
e melting of the heat
exchanger.
1. Insert the temperature limiter (3, Fig 903) into the heat
ex
changer (4) and press down retaining clip.
NOTE
Make sure the retaining clip is
heard to click fully in
place. Only then will the temperature limiter be in proper
installation position.
If clip does not audibly engage
• clean seat of the temperature limiter on the heat
ex
changer
• clean groove on heat exchanger
• ensure that the locking cams are present on both
side
s of the spring. Renew temperature limiter if
necessary.
2. Fit protective cap (1) and secure with clamp (2).
3. Torque tighten hose clamp with 1 Nm ± 10%.
4. Make electrical connections (see 9.2.1.2).
5. Install heater (see 8.7.1.2).
9.2.4 Replacement of Temperature Sensor
9.2.4.1 Removal
1. Remove heater (see 8.7.1.1).
2. Disconnect electrical connections (see 9.2.1.1).
WARNING
Escaping hot coolant may cause burns.
3. Unscrew temperature sensor (6, Fig. 903) and
re
move together with O-ring (5).
4. Perform procedures on components after
dis
assembly (see 9.1.1).
9.2.4.2 Installation
1. Apply acid free grease (Vaseline) to O-ring
(5
, Fig. 904).
2. Screw temperature sensor (6) with O-ring (5) into
h
eat exchanger (4) and torque tighten with
1.5 Nm ± 10%.
3. Make electrical connection
s (see 9.2.1.2).
4. Install heater (see 8.7.1.2).
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