Remove/install heater unit

AR83.70-P-5302N

Remove/install heater unit

23.07.2019

Model

170.435/445/447 1# up to 1/31/00

Retrofitted stationary heater Thermo Top C

3

Coolant outlet hose, heater

10

Coupling, control lines

16

Exhaust gas line mount

4

Coolant feed hose, heater

11

Heater holder

21

Exhaust muffler

6

Heater unit mount

12

Combustion air intake hose

A6

Stationary heater unit

7

Fuel line

14

Exhaust line

A6m1

Coolant pump

9

Coupling, power supply

15

Exhaust muffler holder

 

Remove/install

Notes on repairing the stationary heater

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

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

 Clamp

*000589543700

3

Disconnect coolant hoses (4, 3) from heater (A6) and coolant pump (A6m1)

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

4

Disconnect combustion air intake hose (12) and fuel line (7) from heater (A6)

 Collect escaping fuel.

5

Disconnect exhaust gas line (14) from heater (A6)

6

Unfasten heater mount (6)

 The nuts are located in the left wheel arch.

7

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

 

Disassemble/assemble

8

Disconnect heater holder (11)

 The holder is secured to the heater with 3 screws (EJOT PT).

 Model 170.435/445/447Bolt, bracket to heater

*BA83.70-P-1009-01A

9

Disconnect coolant pump (A6m1) from heater (A6)

AR83.70-P-5700F

 Installation: Attach cover with straight inlet fitting to coolant pump.

10

Install in the reverse order

11

Bleed coolant circuit after installation of heater

AR83.70-P-5302-01E

Check

12

Check fuse assignment of heater (A6) on left in engine compartment



GF54.15-P-1256-02A

 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

13

Start up stationary heater



AZ83.70-P-0008-04A

 If the heater (A6) switches off automatically before reaching its operating temperature and cannot then be restarted, a fault interlock is present

a fault interlock exists.



Override malfunction interlock

AR83.70-P-5302-07A

14

Check cooling system for leaktightness

AR20.00-P-1010HA

 Stationary heater

Number

Designation

MODEL 170, 202, 208, 210 with Thermo Top C heater

BA83.70-P-1009-01A

Bolt, bracket to heater

Nm

10