Remove/install PTC heater booster

AR83.70-D-8000A

Remove/install PTC heater booster

22.09.2016

Model

900, 906

with code HH2 (Electrically powered hot-air auxiliary heater)

Shown on model 906 with code HH9 (Semi-automatically controlled air conditioning, TEMPMATIC) and with code H00 (Hot air duct to passenger compartment)

1

PTC heater booster

6

Drain hose

2

Heater housing

7

Nut

3

Screw

8

Air ducts

4

Ground cable

9

Screw

5

Positive line

10

Air distributor

1

PTC heater booster

11

Nut

2

Heater housing

12

Electrical connector

3

Screw

13

Electrical wiring harness

5

Positive line



Notes on self-locking nuts and bolts

AH00.00-N-0001-01A



Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A



Notes on carrying out repair work in the vehicle interior

AH68.00-N-0001-01S

 

Remove/install

1

Remove floor covering on driver side

AR68.20-D-2050A

2

Disconnect battery ground line

AR54.10-D-0003SD

3

Release floor covering on passenger side far enough and fold to rear so that the air ducts (8) can be removed

Model 906
with code H00 (Hot-air duct to passenger compartment)
with code HH2 (Electrically powered hot-air auxiliary heater)

4

Remove cover on gearshift lever

AR68.20-D-2310A

5

Remove air ducts (8)

Model 906
with code H00 (Hot-air duct to passenger compartment)
with code HH2 (Electrically powered hot-air auxiliary heater)

6

Remove screw/bolt (9)

7

Remove air distributor (10)

8

Unscrew nut (7)

 Installation: Replace nut (7).

 Nut, ground line to PTC heater booster

*BA83.70-N-1001-02B

9

Remove ground line (4) and move to one side

10

Remove drain hose (6) from heater housing (2) and move to one side

Model 900, 906
with code HH2 (Electrically powered hot-air auxiliary heater)
with code HH9 (Air conditioner, automatic heater control)

 Installation:
Ensure drain hose (6) is correctly seated on heater housing (2).
Otherwise, water damage may occur in the vehicle interior.

11

Unscrew nut (11)

 Installation: Replace nut (11).

 Nut, positive line to PTC heater booster

*BA83.70-N-1002-02B

12

Remove positive line (5) and move to one side

13

Disconnect electrical connector (12)

14

Expose electrical wiring harness (13) on heater housing (2) (arrow)

15

Remove bolts (3)

16

Route PTC heater booster (1) downwards out of heater housing (2) and remove

 Note assembly position for PTC heater booster (1).



Check

17

Check drain hose (6) for damage

For damage



Replace drain hose (6)

18

Install in the reverse order



Check

19

Run function test on PTC heater booster (1) in "Actuations" menu



AD00.00-D-2000-04SD

 Heater booster unit

Number

Designation

Model 900, 906
with code HH2 (Electrically powered hot-air auxiliary heater)

BA83.70-N-1001-02B

Nut, ground line to PTC heater booster

Nm

14

 Heater booster unit

Number

Designation

Model 900, 906
with code HH2 (Electrically powered hot-air auxiliary heater)

BA83.70-N-1002-02B

Nut, positive line to PTC heater booster

Nm

14