Remove/install heater unit

AR83.70-P-5302H

Remove/install heater unit

23.07.2019

Model

202.### 1# as of 6/1/97

Retrofitted stationary heater Thermo Top C

3

Coolant outlet line, heater

10

Coupling, control lines

16

Exhaust gas line mount

4

Coolant feed line, heater

11

Heater holder

20

Red spacer

6

Heater unit mount

12

Combustion air intake line

21

Exhaust muffler

7

Fuel feed line

14

Exhaust line

A6

Stationary heater unit

8

Coupling, coolant circulation pump

15

Exhaust gas line holder

A6m1

Coolant recirculation pump

9

Coupling, power supply

 

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 rooms or when refueling. Allow heater unit to cool down after operation and wear protective gloves.

AS83.70-Z-0002-01A

Notes on repairing the stationary heater

AH83.70-P-0001-03D

Distinguishing features stationary heater/stationary preheater/heater booster

AH83.70-P-0003-01B

1.1

Remove front section from noise encapsulation

Model 202.1

AR94.30-P-5300A

1.2

Remove front engine compartment paneling

Model 202.### (except 202.1)

AR61.20-P-1105AB

2

Remove right cover of wheel well fender liner

 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

3

Release pressure in coolant circuit

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

4

Clamp off coolant feed and coolant outlet line (4 and 3)

 Clamp

*000589543700

5

Unfasten heater mount (6)

 2 nuts on longitudinal member, 1 screw with shim under lamp unit, support heater.

6

Guide heater (A6) out downward and, when doing so, detach couplings (9, 10) of the electrical connection lines

 Tilt heater to right side of vehicle and pull downward.

7

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

 Collect escaping fuel.

8

Unclip heater cover (5) and detach coupling (8) of coolant circulation pump (A6m1)

9

Disconnect coolant lines (4, 3) at heater

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

 

Disassemble/assemble

10

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

11

Disconnect exhaust gas line holder (15) and exhaust muffler holder (21) from heater (A6)

12

Disconnect heater holder (11) and remove stud bolt

 Check stud bolt; replace with new one if necessary.

 Model 202Bolt, bracket to heater

*BA83.70-P-1009-01A

13

Install in the reverse order

 Coolant circulation pump (A6m1) is not required.

14

Bleed coolant circuit after installation of heater

AR83.70-P-5302-01E

Check

15

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



GF54.15-P-1256-03B

16

Check cooling system for leaktightness

Model 202

AR20.00-P-1010HA

17

Start up stationary heater



AZ83.70-P-0008-04A

 The heater (A6) switches off automatically before reaching its operating temperature and cannot be restarted again;

there is a fault interlock (continue with).



Override malfunction interlock

AR83.70-P-5302-07A

 Stationary heater

Number

Designation

MODEL 202, 203, 210 Thermo Top S heater

BA83.70-P-1009-01A

Bolt, bracket to heater

Nm

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