Remove/install heater unit

AR83.70-P-5302T

Remove/install heater unit

15.12.09

5.7.06

"Disconnect/connect battery ground line" removed

 

Remove/install

1

Open engine hood and move to vertical position

AR88.40-P-1000T

2

Remove fender liner front section in front fender

 Front part section, right.

AR88.10-P-1310T

3

Release pressure in coolant circuit

 In order to achieve this, undo the coolant compensation tank closure cap.

4

Pinch off coolant hoses (4) using clamps (3)

 Clamp.

*000589403700

5

Disconnect coolant hoses (10)

6

Unfasten clamp (9) and remove exhaust line from STH heater unit (A6)

7

Disconnect electrical connector (11) from solenoid valve

8

Detach fuel hose (1) from fuel line (2)

9

Unclip fuel line (2) from clip (8)

10

Remove nuts (6)

 Nut, solenoid valve to bracket

*BA83.70-P-1010-01C

11

Remove bolts (5)

Bolt for heater bracket on body.

*BA83.70-P-1005-01C

12

Remove vent hose (12) from right front fog lamp (E5/2)

13

Disconnect electrical connector (13) from right front fog lamp (E5/2)

14

Disconnect electrical connectors (14) from STH heater unit (A6)

15

Remove bolts (15)

 Nut, solenoid valve bracket to heater unit.

*BA83.70-P-1009-01C

16

Pull out STH heater unit (A6) downwards out of bracket (16)

 Push bracket (7) slightly to the side when doing this.

 

Disassemble/assemble

17

Disconnect coolant hose (18) from STH heater unit (A6).

18

Detach fuel hose (17) with fuel line (2) from STH heater unit (A6)

19

Remove screw (19) and unhook bracket (20)

20

Remove intake muffler (21) from STH heater unit (A6)

21.1

Screw screws (15) into existing holes of STH heater unit (A6) and unscrew again

 Only if a new STH heater unit (A6) is being installed.

22

Assemble in the reverse order

23

Install in the reverse sequence

Check

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

AS83.70-Z-0002-01A

24

Start up stationary heater

 See Star Diagnosis.

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

To clear malfunction interlock, refer to Star Diagnosis.

25

Bleed coolant circuit after installing heater unit

AR83.70-P-5302-01M

Number

Designation

Model
211
with Thermo Top C heater

BA83.70-P-1005-01C

Bolt for heater bracket on body

Nm

6

BA83.70-P-1009-01C

Nut, solenoid valve bracket to heater

Nm

6

BA83.70-P-1010-01C

Nut, solenoid valve to bracket

Nm

4