Remove/install heater

AR83.70-P-5302MB

Remove/install heater

7.9.10

 

Remove/Install



Notes on repairs to Telestart

 If the vehicle has been installed with Telestart T61: 

AH83.70-P-0003-02M

Remove heater

AR83.70-P-5302MA

1

Connect no load current retention unit

*WH58.30-Z-1012-09A

2

Disconnect ground cable of battery

AR54.10-P-0003I

3

Remove inner liner in front fender

 Only on right-hand side.

AR88.10-P-1300M

4

Remove body panel at exhaust through feed (4 nuts)

 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

5

Relieve pressure in coolant circuit

 To do so open the coolant expansion tank cap.

6

Detach coolant feed hose (3) and coolant return hose (4) from heater with matra clamps

 Circuit.

*000589403700

7

Detach coolant feed hose (3) downstream of check valve (2)

 Collect escaping coolant in a clean vessel and return to the coolant compensation tank following the installation of the heater unit.

8

Detach coolant return hose (4) from circulation pump (A6m1)

 Collect escaping coolant in a clean vessel and return to the coolant compensation tank following the installation of the heater unit.

 Danger!

Risk of explosion from fuel igniting, risk of poisoning from inhaling and swallowing fuel as well as risk of injury to eyes and skin from contact with fuel.

No fire, sparks, naked flames or smoking.
Pour fuels only into suitable and appropriately marked containers.

Wear protective clothing when handling fuel.

AS47.00-Z-0001-01A

9

Detach fuel hose (7) from fuel line (magnifier)

 Collect escaping fuel.

10

Undo nuts (6) in wheel housing and longitudinal frame member

11

Unclip black, 2-pin coupling (9) and black, 6-pin coupling (10) from STH heater unit or heater booster (A6)

12

Remove STH heater unit or heater booster (A6) with bracket (11) and circulation pump (A6m1) from wheel housing

 Pull off combustion air intake hose (12) from impression in wheelhouse.

Installation: Check that the groove (see arrow) of the combustion air intake hose (12) is correctly seated.

13

Remove detachable body components on stationary heater/heater booster

 Installation: Make sure that only one STH heater unit or heater booster (A6) as of model year 01.00 is installed.

AR83.70-P-5302-08MB

 Bolts of bracket to heater unit

*BA83.70-P-1009-01A

14

Install in the reverse order

 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

15

Bleed coolant circuit following installation of the heater

AR83.70-P-5302-01M



Check

 Danger!

Risk of explosion from fuel vapors, risk of poisoning from inhaling combustion gases and risk of injury from 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

16

Start up stationary heater

 See Star Diagnosis.

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



To clear malfunction interlock,
refer to Star Diagnosis.

17

Inspect cooling system for leaks

Engine 628.

Engine 648.960.

AR20.00-P-1010HA

Number

Designation

Models
215, 220, 230
Thermo Top C heater

BA83.70-P-1009-01A

Screw for heater mount

Nm

10

Number

Designation

WH58.30-Z-1012-09A

Quiescent current retention unit