Heater and ventilation, heater booster - function check

AP83.00-T-8351A

Heater and ventilation, heater booster - function check

30.10.98

Check

1

Make sure that the shut-off valves in the hot water feed and return lines are open

See owner's manual

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns when working in engine during starting procedure

Secure vehicle to prevent it from moving.
Wear closed and snug-fitting work clothes.
Do not grasp hot or rotating parts.

AS00.00-Z-0005-01A

2

Start engine

 A minimum coolant temperature
of 50 °C must be ensured. Switch on auxiliary heater if necessary.

3

Close all swiveling doors

See owner's manual

Check driver area ventilation

4

Set switch gradually for front area ventilation up to next highest blower output

 See Operating Instructions

The blower output at the air outlets on the driver area must increase significantly.

5

Press the air distribution switch for the front area ventilation and check for proper operation

See owner's manual

Check recirculated air mode in driver area

6

Switch recirculated air flap switch for driver area to recirculated air or fresh air position

 See Operating Instructions

A change in the noise level of the front area ventilation signals the switchover of the recirculated air flap.

Check driver area heater

7

Set temperature selector for front area to highest heat output

See owner's manual

8

Measure temperature of air exiting at air outlets

 Hot air must exit at the driver area air outlets.



*WH58.30-Z-1002-08A

Check passenger compartment roof ventilator

9

Open roof ventilator (3) by turning the covers

10

Set the ventilation direction switch (2) alternately to extraction or ventilation

 Depending on the position of the switch the air should be extracted by way of the roof ventilator (3) or blown in.

11

Switch off ventilation direction switch (2)

12

Close roof ventilator (3) by turning the covers

Check ventilation of the floor heaters in passenger compartment

13

Gradually set floor heater switch (1) to highest output

 The blower output must increase significantly at the floor heaters (4) in the entire passenger compartment.

Check heater system floor heaters in passenger compartment

14

Measure temperature of air exiting floor heaters (4)

 Hot air must exit at the floor heaters (4).



*WH58.30-Z-1002-08A

15

Switch off floor heater switch (1)

16

Check auxiliary heater

AP83.00-T-8351-01B

17

Turn off engine

Number

Designation

WH58.30-Z-1002-08A

Digital temperature measuring instrument (measuring range -20° to +70°)