Remove/install heater unit

AR83.70-D-5302I

Remove/install heater unit

6.10.99

 

Remove/Install

 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

1

Remove front grille

Model 901.6, 902.6, 903.6, 904.6, 905.6, 690.6

up to model year 2003

AR88.00-D-2115B

Model 901.6, 902.6, 903.6, 904.6 , 905.6

as of model year 2003

AR88.00-D-2115C

2

Remove left headlamp unit

AR82.10-D-4730A

3.1

Take circulation pump off the heater bracket

With warm water auxiliary heater 10 kW with timer, code HZ5

 Place circulation pump to side. Do not detach hoses.

AR83.70-D-5700A

4

Pinch off coolant hoses (2, 3)



*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

5

Detach coolant hoses (2, 3) from heater unit (4)

 Collect escaping coolant in a clean vessel.

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 contact with fuel.

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

Wear protective clothing when handling fuel.

AS47.00-Z-0001-01A

6

Remove fuel line (1) from heater unit (4)

Seal fuel line using suitable plug.

7

Disconnect 2-pin and 8-pin connector

Disconnect (X164, X165)

8

Unclip suction line (7) from both brackets (arrows) on the front-end side panel

9

Undo screw (5) on front end and rear side of heater unit bracket (6)

10

Remove bracket (arrow) of exhaust gas line (8) from left wheelhouse and remove exhaust gas line downwards from heater unit

11

Remove heater from heater unit bracket

12

Disconnect exhaust gas line from heater unit

13

Install in the reverse order

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns when working in engine during starting procedure

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

14

Start the engine and allow it to warm to its normal operating temperature

 Allow engine to run for approx.
1 minute at varying speed.

15

Check engine coolant level and top up with coolant if necessary

16

Turn off engine

17

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

18

Check auxiliary heater/heater booster for proper operation