Remove/install heater booster

AR83.70-D-7100A

Remove/install heater booster

18.11.02

 

Remove/Install

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 while filling fuel tank. Allow heater unit to cool down after operation and wear protective gloves.

AS83.70-Z-0002-01A

1

Disconnect tailpipe (1) from side wall (arrow) and detach from exhaust muffler (2)

2

Pinch off coolant hoses (3, 6)

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*000589543700

3.1

Disconnect coolant hose from heater to the additional heat exchanger

for additional heat exchanger in load compartment Code H13



*000589543700

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

4

Detach coolant hoses (3, 6) from heater booster (5)

Collect escaping coolant in a clean vessel.

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

5

Remove fuel line (4) from heater booster (5)

Seal fuel line using suitable plug.

6

Disconnect wiring harness (10) of heater booster from heater unit bracket (8) and disconnect 8-pin connector (A90x1)

7

Remove induction pipe (7) from underbody (arrow)

8

Undo four nuts (9) of heater unit bracket (8) and remove heater unit bracket with heater booster from underbody

9

Unscrew exhaust muffler (2) from heater unit bracket (8) and remove exhaust-gas line (13) from heater booster

10

Disconnect induction line (7) and heater booster connecting line (11) from heater unit bracket (8)

 Installation: tie up induction line and connecting line using joint cable tie (arrow) onto heater unit bracket.

11

Detach induction line (7) from heater booster's connecting pipe

12

Undo screw (12) on front end and rear side of heater unit bracket (8)

13

Remove heater booster out of heater unit bracket

14

Install in the reverse order

Danger!

Risk of accident. Accidents may result if the vehicle starts off unintentionally with the engine running. Risk of injury as working around the engine during startup or while running may result in contusions and burns

Secure vehicle to prevent it from moving.
Wear closed and snug-fitting work clothes.
Do not grasp hot or rotating parts.

AS00.00-Z-0005-01A

15

Start the engine and allow it to warm-up

 Allow engine to run for approx. 1 min at alternating speeds.

16

Check engine coolant level and top up with coolant if necessary

17

Switch off engine

18

Check coolant hose and fuel line connections on heater unit for signs of any leaks

19

Check heater booster for proper operation