Remove/install PTC heater booster

AR83.70-P-8000RT

Remove/install PTC heater booster

20.01.2020

Model

251 with engine 642

1

Electrical connector

4

Bolts

2

Nut

R22/3

PTC heater booster

3

Nut

5

Bolts

10

Screw

6

Screw

11

Bolts

7

Nut

12

Bolts

8

Nut

13

Instrument panel retaining frame

9

Nut

 

Remove/install

 Danger

Risk of fire/risk of explosion due to short circuit and escaping oxyhydrogen gas. Risk of (burn) injury caused by caustic burns to eyes, skin and mucous membranes from battery electrolyte/mist, short circuit and arcing. Risk of poisoning caused by swallowing battery electrolyte or absorption of lead through the skin or body orifices. Risk of death due to voltage U >= 30 V AC and U >= 60 V DC.

No fires, sparks, open flames, or smoking. Wear acid-resistant gloves, clothing, and glasses. Pour battery acid only into suitable and appropriately marked containers.

AS54.10-Z-0001-01A

Topical note

Notes on battery

AH54.10-P-0001-01A

1

Fully retract steering column and move driver's seat all the way back

2

Disconnect battery ground line

AR54.10-P-0003RT

3

Remove center console

AR68.20-P-2000RT

4

Remove CD changer

AR82.64-P-7508RT

 On vehicles with code 819 (CD changer).

5

Remove instrument panel

AR68.10-P-1000RT

6

Remove jacket tube

AR46.10-P-0400RT

7

Disconnect electrical connection (1)

8

Unscrew nut (2) from ground line and remove ground line from PTC heater booster (R22/3)

 Nut, ground line to PTC heater booster

*BA83.70-P-1002-02H

9

Unscrew nut (3) from positive line and remove positive line from PTC heater booster (R22/3)

 Nut, positive line to PTC heater booster

*BA83.70-P-1001-02H

10

Remove bolts (4)

11

Remove screws (5, 12)

 Screw/bolt, dashboard crossmember to A-pillar

*BA68.10-P-1002-01C

12

Remove screw (6, 10)

 Screw/bolt, dashboard crossmember to transmission tunnel

*BA68.10-P-1003-01C

13

Unscrew nut (7, 8, 9)

14

Loosen screws (11)

 Loosen screws (11) until instrument panel retaining frame (13) can be pulled far enough forward to gain access to the PTC heater booster (R22/3).

 Screw/bolt, dashboard crossmember to firewall

*BA68.10-P-1001-01C

15

Detach instrument panel retaining frame (13) towards front away from air conditioner housing and lift upwards

16

Remove PTC heater booster (R22/3) from air conditioner housing

 Installation: Ensure that PTC heater booster (/R223) is seated correctly in air conditioner housing.

17

Install in the reverse order

18

Perform basic programming

AR00.19-P-0200RT

 Instrument panel

Number

Designation

Model 251

BA68.10-P-1001-01C

Screw/bolt, dashboard crossmember to firewall

Nm

30

 Instrument panel

Number

Designation

Model 251

BA68.10-P-1002-01C

Screw/bolt, dashboard crossmember to A-pillar

Nm

30

 Instrument panel

Number

Designation

Model 251

BA68.10-P-1003-01C

Screw/bolt, dashboard crossmember to transmission tunnel

Nm

30

 Heater booster unit

Number

Designation

Model 251

BA83.70-P-1001-02H

Nut, positive line to PTC heater booster

Nm

8

 Heater booster unit

Number

Designation

Model 251

BA83.70-P-1002-02H

Nut, ground line to PTC heater booster

Nm

15