Remove/install heater unit

AR83.70-D-5302C

Remove/install heater unit

12.12.06



Remove/install

 Danger!

Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel and 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

Danger!

Risk of injury to skin and eyes caused by scalding from contact with hot coolant spray. Risk of poisoning caused by 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

1

Release pressure in cooling and heating circuit at coolant expansion reservoir cap

2

Provide clean container for collecting escaping coolant

3

Remove cable tie (12)

4

Detach bayonet nut (3) and disconnect connector

5

Clamp off coolant hose (5)



*000589543700

6

Loosen hose clamp (6) on connection fitting (7) of coolant recirculation pump and detach the coolant hose (5)

7

Loosen hose clamp (8) on connection fitting (11) of heater (9) and detach the coolant hose (10)

8

Remove bolts (20) from bracket (18) of regulating valve

Only with code H13 or H67 Additional heat exchanger

*BA83.70-N-1002-03B

9

Loosen hose clamp (19) on fuel line connector hose (13) and detach connector hose from connection fitting

10

Seal off fuel line connector hose (13) using a suitable stopper

11

Loosen clamps (14, 15) on exhaust pipe (16) and combustion air intake line (17)

12

Detach exhaust pipe (16) and combustion air intake line (17)

13

Take off cover (26)

 Installation: Insert cover (26) into retaining strip (28) and secure with new plastic bolts (27).

14

Unscrew nuts (29) with washers (21) and remove base plate for control units (22)

 Installation: Replace self-locking nuts (29).

15

Unscrew nuts (24) with washers (25) and remove heater (9)

 Installation: Replace self-locking nuts (24).

*BA83.70-N-1001-03B

16

Install in the reverse order

17

Refill escaped coolant

 Danger!

Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the engine as it is running

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

AS00.00-Z-0005-01A

18

Start engine and run for approx. 1 min at varying rpms to bleed the cooling and heating circuit

 Monitor coolant level in expansion reservoir while engine is running and refill coolant if necessary.

19

Turn off engine

20

Check coolant hose connections (5, 10) to heater (9) for leaks

 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

21

Check function of stationary heater

AR83.70-W-5302-02B

Number

Designation

Model
667, 668, 670 with code H14

BA83.70-N-1001-03B

Nut, heater at bulkhead

Nm

25

BA83.70-N-1002-03B

Bolt, regulating valve bracket to heater

Nm

25