Remove/install electrical heater booster control unit

AR83.70-P-5300GLC

Remove/install electrical heater booster control unit

16.2.12

 

Remove/install

 Danger!

Risk of explosion caused by escaping oxyhydrogen gas. Risk of injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte (contains diluted sulfuric acid) or metal spatter due to short circuit. Risk of burn injuries caused by short circuit. Risk of poisoning caused by swallowing battery electrolyte (contains diluted sulfuric acid) or absorption of lead over the skin or orifices

No fire, sparks, open flames or smoking.

Wear acid-resistant gloves and clothing and safety glasses with side guards.

Do not place any conductive objects on the battery and avoid any short circuit from battery positive to ground.

Only fill liquid battery electrolyte (diluted sulfuric acid) into suitable and appropriately marked containers.

AS54.10-Z-0001-01A

1

Disconnect ground cable of battery

AR54.10-P-0003GL



Notes on battery

All models

AH54.10-P-0001-01A

 Danger!

Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage bottles.

Wear protective gloves, protective clothing and eye protection.

AS20.00-Z-0001-01A

2

Drain coolant

 Collect any escaping coolant in a suitable container.



Replace coolant

AP20.00-P-2080G



Notes on coolant

All engines

AH20.00-N-2080-01A

 Danger!

Risk of death cased by vehicle slipping or toppling off of the lifting platform.

Align vehicle between the columns of the hydraulic hoist and position the four support plates below the hoist support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

3

Lift/jack up vehicle

AR00.60-P-1000G

4

Remove underride guard

5

Remove heater unit

Model 461.331 with auxiliary heater, code H12

AR83.70-P-5302GLC

6

Remove charge air distribution pipe

AR09.41-P-1310GS

7

Remove starter

AR15.30-P-7100GS

8

Disconnect electrical connector (2)

9

Remove electrical connector (3) from heater booster control unit (N33/2)



*BA83.70-P-1002-02C

10

Disconnect electrical connector (4) from heater booster control unit (N33/2)

11

Remove screws (5) from heater booster control unit (N33/2)

 Collect any escaping coolant in a suitable container.

12

Remove heater booster control unit (N33/2) from housing

 Installation: Thoroughly clean the sealing surface on housing.

13

Remove gasket (1) from heater booster control unit (N33/2)

 Installation: The marking (arrow) on the new gasket (1) must be seated in the corresponding notch on the heater booster control unit (N33/2). Secure the gasket (1) in place with acid-free grease.

14

Install in the reverse order

15

Fill and bleed steering system

AR46.20-P-0500-10F

16

Bleed cooling system

AR20.00-P-1142-06GL

17

Inspect cooling system for leaks



Cooling and heating system - check condition of radiator, lines and hoses

AP20.00-P-2050G

18

Check function of heater booster control unit (N33/2)

AR83.70-P-5300-01GL

19

Read out fault memory and erase

 STAR DIAGNOSIS
Stored faults which can result from lines being disconnected or from simulation during removal and installation or test work, have to be processed and erased in the fault memories after completing the work



Connect STAR DIAGNOSIS and read out fault memory

AD00.00-P-2000-04A

*WH58.30-Z-1048-13A

Number

Designation

Models
461.302/331/
332/342/345, 463.322/323

BA83.70-P-1002-02C

Nut, threaded stud to electric heater booster (N33/2)

Nm

18

Number

Designation

WH58.30-Z-1048-13A

STAR DIAGNOSIS diagnosis system, Compact Passenger Car

6511 1801 00