Heater and ventilation, heater booster - function check

AP83.00-T-8351C

Heater and ventilation, heater booster - function check

23.3.00

Inspecting



The coolant temperature should be approx. 50 °C

Switch on auxiliary heater if necessary.



The shut-off valves in the hot water feed and return lines must be open

Danger!

Risk of accident from vehicle starting off by itself when engine running. Risk of injury from contusions and burns if you insert your hands into the engine when it is started or when it is running

Secure vehicle to prevent it from moving off by itself.
Wear closed and close-fitting work clothes.
Do not touch hot or rotating parts.

AS00.00-Z-0005-01A

1

Apply parking brake

2

Start engine

3

Check automatic mode malfunction indicator lamps by pressing button (2)

4

Check blower for the passenger compartment

 Press the button for blower setting for the passenger compartment (3). The malfunction indicator lamp must illuminate.
Select the maximum fan setting (100%) using the setting buttons (1) and check that warm air comes out of the warm air outlets in the passenger compartment.

5

Check front heater fan

 Press the button for the blower setting for the front heater unit (7) for longer than 2 seconds. The malfunction indicator lamp must illuminate.
With the setting buttons (1), adjust the maximum blower output (100 %) and check the warm air outlet at the air outlet openings at the driver's seat

6

Check front heater temperature setting

 Press the button for the temperature setting for the front heater unit (6). The malfunction indicator lamp must illuminate.
With the setting buttons (1) adjust the maximum cool temperature and check the air outlet at the air outlet openings at the driver's seat. The temperature must reduce significantly.
Then select the maximum heating temperature using the setting buttons (1) and check the air that comes out of the air outlets at the driver's seat. The temperature must increase considerably.

7

Check the air distribution for the front windshield ventilation (8) and footwell ventilation (9) at the front heater unit

 Switch windshield ventilation (8) and footwell ventilation (9) on and off alternately. The malfunction indicator lamps must illuminate. Check the air outlet at the air outlet openings at the front windshield and in the footwell.

8

Check recirculating air system

 Press the recirculating air button (5). The malfunction indicator lamp must illuminate. Recirculating air mode has now been activated for the passenger compartment.
Then press the button for longer. The malfunction indicator lamp must illuminate. In this setting the recirculated air mode is activated for the passenger compartment and the driver's seat.

9

Check auxiliary heater

 Only model 613.365.

AP83.00-T-8351-01C

10

Switch off engine