Remove/install heater unit

AR83.70-P-5302P

Remove/install heater unit

18.03.2019

Model

202.### 1# up to 5/31/97

Convert retrofitted Thermo Top S stationary heater to Thermo Top C stationary heater

Removal of Thermo Top S

3

Coolant outlet line, heater

9

Coupling, power supply

18

Clamping tab

4

Coolant feed line, heater

10

Coupling, control lines

21

Exhaust muffler

6

Heater mount

11

Heater holder

A6

Heater booster unit

7

Fuel feed line

17

Screw



Remove

 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

Distinguishing features stationary heater/stationary preheater/heater booster

AH83.70-P-0003-01B

Notes on repairing the stationary heater

AH83.70-P-0001-03D

1.1

Remove front section from noise encapsulation

Model 202.1

AR94.30-P-5300A

1.2

Remove lower 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.



Check

4

If heater (A6) a Thermo Top C?

If yes: Heater is not same as that shown in figure; continue with



Remove/install heater unit

AR83.70-P-5302K

5

Remove air filter

AR09.10-P-1050A

6

Pull couplings (9, 10) of electrical connection line

7

Disconnect coolant feed line (4) and drain off coolant

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

 Clamp

*000589543700

8

Loosen screw (17), unhook clamping tab (18) and pull heater (A6) out of holder (11)

 Heater is no longer required.

9

Disconnect coolant outlet line (3)

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

10

Disconnect fuel feed line (7)

 Collect escaping fuel.

11

Remove heater holder (11)

 A nut is underneath the lamp unit. Heater holder is no longer required.

12

Detach mount of pipe system (2) and remove pipe system (1) from longitudinal member

 Pipe system is no longer required.

13

Remove coolant hoses between pipe systems

 Hoses are no longer required.



Install

14

Prepare heater for installation

AR83.70-P-5302-06A

 Prepare vehicle for conversion and install Thermo Top C heater.

 Model 202 up to 5/31/97
Retrofitted stationary heater with Thermo Top S or Thermo Top C heaterBolt, bracket to heater

*BA83.70-P-1009-01A

15

Bleed coolant circuit after installation of heater

AR83.70-P-5302-01E

Check

16

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



GF54.15-P-1256-03B

17

Check cooling system for leaktightness

Model 202.### 1# up to 5/31/97 with engine 111, 112, 113, 601, 604, 605, 611Convert retrofitted Thermo Top S stationary heater to Thermo Top C stationary heater

AR20.00-P-1010HA

18

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

(continue with).



Override malfunction interlock

AR83.70-P-5302-07A

 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