Replacing Overheat Temperature Sensor; Replacing Heating Air Fan; Replacing Drive Unit - Webasto Air Top Evo 40 Series Service Manual

4. Install housing parts (see 9.2.2).
5. Install heater (see 8.7.1.2)
6. Check CO

9.2.4 Replacing Overheat Temperature Sensor

9.2.4.1 Removal
1. Remove heater (see 8.7.1.1).
2. Remove housing parts (see 9.2.1).
3. Disconnect plug connection X3 from control unit (4, Figure 30).
IMPORTANT: Do not pull the cables.
4. Lever overheat temperature sensor (9) out of heat exchanger's ribs using a suitable tool (see Detail A).
5. Remove overheat temperature sensor (9).
9.2.4.2 Installation
1. Position overheat temperature sensor (9) and press it into place by hand.
2. Make sure that overheat temperature sensor (9) is properly positioned in heat exchanger (8).
3. Connect plug connector X3 on control unit (4).
4. Install housing parts (see 9.2.2).
5. Install heater (see 8.7.1.2)

9.2.5 Replacing heating air fan

9.2.5.1 Removal
1. Remove heater (see 8.7.1.1).
2. Remove housing parts (see 9.2.1).
3. Position a pair of long-nose pliers from the front between the two locking lugs on the motor shaft. Hold
heating air fan (1, Figure 30) with one hand and simultaneously and carefully spread two lugs with a slight
twisting movement. Pull off heating air fan (1).
9.2.5.2 Installation
1. Make sure locking lugs are undamaged.
2. Slide heating air fan (1, Figure 30) onto motor shaft until engaging of lugs on both sides is audible at stop.
3. Install housing parts (see 9.2.2).
4. Check smooth running of heating air fan (1) by hand, then listen for any noises when switching on later. The
sensor magnets on the heating air fan (1) must be free from chips containing iron, etc.
5. Install heater (see 8.7.1.2)

9.2.6 Replacing drive unit

IMPORTANT: Only replace the drive unit (2, Figure 30) with a drive unit with the same performance data and the
same ID No.
9.2.6.1 Removal
1. Remove heater (see 8.7.1.1).
2. Remove housing parts (see 9.2.1).
3. Remove heating air fan (1) (see 9.2.5.1).
4. Remove control unit (4) (see 9.2.3.1).
5. Remove screws (3).
6. Remove drive unit (2) toward front.
IMPORTANT: Do not lay drive unit on combustion air or heating air fan!
Air Top Evo 40 / Air Top Evo 55 Service Manual
setting and adjust if necessary (see Section 6.3).
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