Remove/install heater unit

AR83.70-P-5302MFA

Remove/install heater unit

04.06.2019

Model

118, 177, 247

with code 228 (Auxiliary heater)

Modification notes

21.02.2019

"Drain coolant" added.

Operation step 8

Shown on model 177.0 with code 228 (Stationary heater)

1

Electrical connectors

2

Clamp

3

Fuel hose

4

Fuel line

5

Hose clamps

6

Coolant hoses

7

Coolant line

8

Screw

9

Bracket

10

Guide

A6

Stationary heater unit

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

 Danger

Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel.

No fires, sparks, open flames or smoking. Pour fuels into suitable and appropriately marked containers only.
Wear protective clothing when handling fuel.

AS47.00-Z-0001-01A

 Warning

Risk of injury. Skin or eye injuries may result when handling hot or glowing objects.

Wear protective gloves, protective clothing and safety glasses, if necessary.

AS00.00-Z-0002-01A

 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

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Notes on safety-relevant components

AH00.00-Z-0019-01A

 

Remove/install

1

Perform commissioning of the stationary heater.

When replacing stationary heater unit (A6).



AD00.00-P-2000-06MFA

2

Detach ground line of on-board electrical system battery.

AR54.10-P-0003MFA

3

Slowly unscrew cap of coolant expansion reservoir and reduce overpressure.

4

Remove front right wheel and tire assembly.

AR40.10-P-1102MFA

5

Remove front section of the fender liner in the front right fender.

AR88.10-P-1301MFA

6

Release and disconnect electrical connectors (1) and unclip from cable bracket of stationary heater unit (A6).

 Dismantling tool

*000589956300

7

Open clamp (2), detach fuel hose (3) from fuel line (4) and seal openings using suitable stop plugs.

 Installation: Replace clamp (2).
Check that fuel line (4) is correctly seated.

 Pliers for click clamps

*171589003700

 Record plug

*129589009100

8

Drain off coolant.

Model 118, 177, 247 with engine 654
with code 228 (Auxiliary heater)

AR20.00-P-1142MFF

Model 118, 177, 247 with engine 608
with code 228 (Auxiliary heater)

AR20.00-P-1142MFE

Model 118, 177, 247 with engine 260, 282
with code 228 (Auxiliary heater)

AR20.00-P-1142MFC

9

Open hose clamps (5), detach coolant hoses (6) and seal openings with protective covers.

 Collect the discharged coolant in a suitable container.

 Set of protective covers

*001589019100

 Hose clamp pliers

*003589033700

10

Release and disconnect coolant line (7) and seal openings with protective covers.

Model 118, 177, 247 with engine 260, 282, 608, 654
with code 228 (Auxiliary heater)

AR20.20-P-7441-01RQ

 Collect the discharged coolant in a suitable container.

 Set of protective covers

*001589019100

11

Remove screws (8).

 Screws, heater bracket to body

*BA83.70-P-1003-02F

12

Pull stationary heater unit (A6) at rear out of holder (9) and remove stationary heater unit (A6).

 Installation:
The stationary heater unit (A6) must enter correctly with the guide (10) into the bracket (9).
Otherwise, there may be damage at the stationary heater unit (A6).

13

Remove all detachable parts of stationary heater unit (A6).

When replacing stationary heater unit (A6).

 Hose clamp pliers

*003589033700

 Dismantling tool

*000589956300

14

Install in the reverse order.

15

Carry out function check of stationary heater.

 If the stationary heater unit (A6) switches off automatically before reaching its operating temperature and cannot be restarted again a malfunction interlock is present.

If a fault interlock is present.



Rectify fault interlock with vehicle diagnosis system.



AD00.00-P-2000-06MFA

 Heater booster unit

Number

Designation

Model 118

Model 177

BA83.70-P-1003-02F

Screws, heater bracket to body

Nm

6

6

 Heater booster unit

Number

Designation

Model 247

BA83.70-P-1003-02F

Screws, heater bracket to body

Nm

6