Removing and installing stationary heater unit

AR83.70-P-5302GA

Removing and installing stationary heater unit

7.9.10

 

Removing, installing



Differentiating characteristics for stationary heater/stationary preheater/heater booster

Model 210

AH83.70-P-0003-01B

1

Remove bottom part of noise encapsulation at front

AR94.30-P-5300AB

2

Remove right-hand cover on wheel arch panel at fender inner liner

Danger!

Risk of injury to skin and eyes from scalding with hot coolant which splashes out. 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

3

Relieve pressure in coolant circuit

 To do so move the coolant expansion tank's cap to notched position 1.

4

Pinch off coolant feed and coolant outlet hoses (4 and 3)



*000589543700

5

Remove exhaust muffler (21) and exhaust pipe (14) from heater unit (A6) and bracket (11)

 The exhaust pipe and the exhaust muffler are mounted to the bracket by a bolt each.

6

Terminate coolant feed hose (4) at coolant pump (A6m1)

 Collect any escaping coolant in a clean container and feed back into the coolant expansion tank after heater installation is complete.

7

Remove screws (6) for heater unit mounting on the left and right-hand sides of the bracket (11)



*BA83.70-P-1009-01A

8

Pull heater (A6) out of bracket (11), starting at the right-hand side of the vehicle

9

Detach connector of coolant pump (8) from stationary preheater wiring harness (1)

10

Unclip connectors (9 and 10) for the electrical connection lines

11

Pinch off fuel feed line (7) and connect to heater (A6)



 Collect escaping fuel with a cloth.

*000589403700

12

Detach coolant outlet hose (3) from heater (A6)

 Collect any escaping coolant in a clean container and put back into the coolant expansion tank after heater installation is complete.

 

Disassembling, assembling

13

Disconnect combustion-air intake hose (12) at the heater

14

Disconnect coolant pump (A6m1) with coolant hose from heater (A6)

Installation: First of all hook the clip onto the heater.

AR83.70-P-5700JB

15

Install in the reverse order

Testing

16

Bleed coolant circuit after completing installation of heater unit

AR83.70-P-5302-01B

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 or engine with heater booster in closed premises or when refueling. Allow heater unit to cool down after operation and wear protective gloves.

AS83.70-Z-0002-01A

17

Conduct heater booster (ZUH) operational check, diagnosis

AD83.70-P-3004A

18

Conduct commissioning of stationary preheater

 If the heater unit (A6) switches off automatically before reaching its operating temperature and fails to start up again then the malfunction interlock is active (continue with ).

AZ83.70-P-5302-08B

Override malfunction interlock

AR83.70-P-5302-07B

19

Inspect cooling system for leaks

AR20.00-P-1010HA

Number

Designation

Models
170, 202, 208, 210
with Thermo Top C heater unit

BA83.70-P-1009-01A

Bolt of bracket to heater unit

Nm

10