Remove/install heater unit

AR83.70-P-5302IB

Remove/install heater unit

23.07.2019

Model

163.128

Retrofitted stationary heater Thermo Top C

3

Coolant outlet hoses, heater

14c

Exhaust line

50

Battery shield

4

Coolant feed hoses, heater

20

Red spacer

100

Ground cable

7

Fuel feed line

30

Check valve

A6

Stationary heater unit

12

Combustion air intake hose

40

Thermostat valve

M13

Coolant circulation pump

9

Coupling, power supply

11

Bracket

11b

Foam cover

10

Coupling, control lines

 

Remove/install

Notes on repairing the stationary heater

Typ 163.128

AH83.70-P-0001-03D

 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

1

Release pressure in coolant circuit

 To do so, turn cap of coolant expansion reservoir to detent position 1.

2

Remove engine cover

3

Remove air filter

 With air filter cross pipe.

4

Unscrew thermostat valve (40) from M6 spacer nut on shield (50)

5

Unscrew ground line (100) from holder on shield (50)

6

Unscrew auxiliary coolant pump (M13) from holder on shield (50)

7

Connect no-load current retention unit

 Do not connect no-load current retention unit

8

Remove battery with shield (50)

9

Clamp off coolant feed and coolant return hose (4, 3)

 Clamp

*000589543700

10

Disconnect fuel line (7) from heater (A6)

 Collect escaping fuel.

11

Disconnect coolant outlet hose (3) and coolant feed line (4) from heater (A6)

 Collect escaping coolant in a clean vessel and, after installation, pour back into coolant expansion reservoir.

12

Loosen pipe clamp on exhaust nozzle of heater (A6) and detach exhaust gas line (14c) with heat protection hose (e)

 Installation: Check heat protection hose (e) for damage and replace if necessary.

13

Disconnect combustion air intake hose (12) from heater (A6)

14

Pull off foam cover (11b) over the two screws on right side of holder (11) and remove screws from heater (A6)

 Carefully detach foam cover (11b).
Installation: Tighten screws to specified torque and bond foam cover over them.

 Bolt, bracket to heater

*BA83.70-P-1009-01A

15

Unscrew all three screws on left side of holder (11) from heater (A6)

 Support heater (A6).
Installation: Tighten screws to specified torque.

 Bolt, bracket to heater

*BA83.70-P-1009-01A

16

Guide heater (A6) out in upward direction and, when doing so, detach couplings (9, 10) of electrical connection lines

 The holder remains in the vehicle.
The vehicle is installed without a coolant circulation pump.

17

Install in the reverse order

18

Bleed coolant circuit after installation of heater

AR83.70-P-5302-01E

Check

19

Check fuse assignment



Fuse assignment of fuse and relay box in left engine compartment

GF54.15-P-1256-03I

 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

20

Commission stationary heater



Start up stationary heater

AZ83.70-P-0008-04A

 If the heater (A6) switches off automatically before reaching its operating temperature and cannot be restarted,

a fault interlock exists:



Override malfunction interlock

AR83.70-P-5302-07I

21

Check cooling system for leaktightness

AR20.00-P-1010HA

 Stationary heater

Number

Designation

MODEL 129, 163, 168 with Thermo Top C heater

BA83.70-P-1009-01A

Bolt, bracket to heater

Nm

10