Remove/install heater unit

AR83.70-D-5302FA

Remove/install heater unit

19.11.2018

Model

909

with code H12 (Auxiliary hot-water heater)

Model

909

with code HZ9 (Heater booster)

1

Fuel line

2

Coolant hose

3

Coolant hose

4

Heater unit

5

Screw

6

Heater bracket

9

Electrical connector

10

Electrical connector

7

Air intake line

8

Exhaust line

 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 rooms or when refueling. Allow heater unit to cool down after operation and wear protective gloves.

AS83.70-Z-0002-01A

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. 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 containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

 

Remove/install

1

Remove left lamp unit.

AR82.10-D-4730F

2

Disconnect coolant hoses (2, 3).

 Clamp

*000589543700

3

Remove coolant hoses (2, 3) from heater (4).

 Collect escaping coolant in a suitable container.

 Danger

Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel.

No fires, sparks, open flames or smoking. Pour fuels into suitable and appropriately marked containers only.
Wear protective clothing when handling fuel.

AS47.00-Z-0001-01A

4

Remove fuel line (1) from heater (4) and seal using suitable stop plug.

 Catch leaking fuel in a suitable vessel.

 Record plug

*129589009100

5

Release and disconnect electrical connectors (9, 10).

6

Unclip air intake line (7) from both holders (arrows) on front end sidewall.

7

Remove bolts (5) from front and rear of heater holder (6).

8

Remove holder (arrow) of exhaust gas line (8) from left wheel arch and remove exhaust gas line (8) downwards from heater (4).

9

Remove heater (4) from heater holder (6).

10

Remove air intake line (7) from heater (4).

11

Install in the reverse order.



Check

 Warning

Risk of burn injuries, suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust.

Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area.

AS49.00-Z-0001-01A

 Warning

Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.

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

AS00.00-Z-0005-01A

12

Start engine and let it warm-up.

13

Check coolant level, and correct coolant, if necessary.

Notes on coolant level

AH20.00-P-1142-01CW



Anticorrosion/antifreeze agents (Sheet 325.0)

BB00.40-P-0325-00A

14

Switch off engine.

15

Check connections of coolant hoses (2, 3) and fuel line (1) on heater (4) for leak tightness.

16

Check heater (4) for proper operation.