Remove/install heater unit

AR83.70-P-5302GLC

Remove/install heater unit

6.8.04

 

Remove/Install

 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

Danger!

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

Align vehicle between the columns of the lifting platform and position the four support plates at the lifting platform support points specified by the vehicle manufacturer.

AS00.00-Z-0010-01A

1

Lift/jack up vehicle

AR00.60-P-1000G

2

Remove underride guard

3

Drain coolant



Replace coolant

AP20.00-P-2080G



Notes on coolant

All engines

AH20.00-N-2080-01A

4

Detach coolant feed line (2) on STH or HB heater unit (A6) and coolant circulation pump

Collect flowing out coolant in a suitable vessel.

5

Detach coolant outlet line (1) on STH or HB heater unit (A6) and coolant circulation pump

Collect flowing out coolant in a suitable vessel.

 Danger!

Risk of explosion caused by fuel vapors igniting, risk of poisoning caused by inhaling combustible gases and risk of injury caused by burns during and after operation of heater unit

Do not operate stationary heater, auxiliary heater or engine with heater booster in closed areas or when refueling. Allow heater unit to cool down after operation and wear protective gloves.

AS83.70-Z-0002-01A

6

Disconnect fuel line (3) on STH or HB heater unit (A6)

 Allow escaping fuel to drain into a suitable container.

7

Detach electrical connectors (4, 5) of STH or HB heater unit (A6)

8

Detach exhaust line (6) on STH or HB heater unit (A6)

9

Detach fresh air line (7) on STH or HB heater unit (A6)

10

Remove STH or HB heater unit (A6)

 To do so undo nuts (8) and remove STH or HB heater unit (A6) upwards.

11

Remove coolant circulation pump

AR83.70-P-5700GM

12

Install in the reverse order

13

Pour in coolant



Replace coolant

AP20.00-P-2080G

14

Bleed coolant circuit after completing installation of STH or HB heater unit (A6)

AR83.70-P-5302-01E

15

Inspect cooling system for leaks



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

AP20.00-P-2050G

16

Start up stationary heater

 If the STH or HB heater unit (A6) automatically switches itself off before reaching its operating temperature and cannot be restarted, there is a fault interlock:



Eliminate malfunction lockout, see

STAR DIAGNOSIS control unit actuation.

AD00.00-P-2000-04A

*WH58.30-Z-1048-13A

Number

Designation

WH58.30-Z-1048-13A

STAR DIAGNOSIS diagnosis system, Compact Passenger Car

6511 1801 00