Remove/install heater housing

AR83.25-T-1000B

Remove/install heater housing

12.06.2019

Model

NMB613.355/358/388/455/485

(Konvekta air conditioner housing version)

Dust filter

3

Dust filter

4

Heater housing

Routing of wiring harnesses

4

Heater housing

6

Electrical connector

4

Heater housing

5

Screw

4

Heater housing

6

Electrical connector

7

Refrigerant line

 

Remove/install

 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

 Danger

Risk of explosion caused by welding or soldering work on closed air conditioning system. Risk of poisoning caused by inhaling overheated refrigerant vapors. Risk of injury to skin and eyes caused by contact with liquid refrigerant.

Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated areas. Carry out repair work on the air conditioning system circuit only after the system has been drained.

AS83.00-Z-0001-01A

Topical note

Protect air conditioning circuit and components from moisture when carrying out repair work

AH83.30-N-0005-01A

Topical note

Procedure for a damaged or leaky air conditioning system

AH83.30-N-0004-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Notes on handling refrigerant R134a

AH83.30-N-0003-01A

1

Drain air conditioning system

Discharge air conditioning system
Model NMB613.355/358/388/455/485
with code HA4 (Konvekta air conditioning with roof heater and timer)
with code HO4 (Front air conditioning)
(Konvekta air conditioner housing version)Model NMB613.358/388
with code HKD (Konvekta ACX 640 air conditioning with roof heater)
with code HO4 (Front air conditioning)

AR83.30-T-1780C

Discharge air conditioning systemModel NMB613.455
with code HKB (Konvekta ACX 641 SAPTCO air conditioning without roof heater)
with code HO4 (Front air conditioning)
Model NMB613.455
with code HKE (Konvekta ACX 642 air conditioning with roof heater)
with code HO4 (Front air conditioning)

AR83.30-T-1780BAS

2

Remove spare tire

 See owner's manual.

3

Depressurize compressed-air circuit for auxiliary consumers

4

Close shutoff valves for heating feed line and return line

 See owner's manual.

5

Remove dust filter (3) of heater box (4)



AP83.00-T-8381BA

 Installation: Check dust filter (3); replace if necessary.

6

Remove electrical wiring harnesses from electrical connectors (6) at heater box (4)

 Installation: Ensure that electric wiring harness is routed properly.

7

Disconnect compressed-air line to heater box (4) at connector coupling

8

Loosen hose clamps and detach heater hoses from heater box (4)

 Clamp off heater hoses using locking pliers. Collect escaping coolant.

 Installation: Check coolant hoses and replace if necessary.

9

Remove condensation drain hose from vehicle frame

Only with code HO4 (Front air conditioning system) (Konvekta air conditioner housing version)

10

Disconnect refrigerant lines (7) of air conditioning system from heater box (4)



Compressor oils (specification 362.0)

BB00.40-P-0362-00A

 Installation:  Do not swap refrigerant lines (7).
 Use new sealing rings.
 Coat sealing rings with compressor oil before installation according to the Specifications for Operating Fluids.

11

Remove screws (5) from heater box (4) at vehicle frame

12

Lift heater box (4) slightly and pull out toward front

 Two elastomer bearings are attached to the rear panel of the heater box (4). These are inserted vertically in two guide bearing panels when the heater box (4) is in its installed state.

 Installation: Check elastomer bearings; replace if necessary. For easier assembly, treat the side insulations of the heater box (4) with lubricant.

13

Install in the reverse order

14

Evacuate air conditioning system and perform leak test

Model NMB613.355/358/388/455/485
with code HA4 (Konvekta air conditioning with roof heater and timer)
with code HO4 (Front air conditioning)
(Konvekta air conditioner housing version)Model NMB613.358/388
with code HKD (Konvekta ACX 640 air conditioning with roof heater)
with code HO4 (Front air conditioning)

AR83.30-T-1762C

Model NMB613.455
with code HKB (Konvekta ACX 641 SAPTCO air conditioning without roof heater)
with code HO4 (Front air conditioning)
Model NMB613.455
with code HKE (Konvekta ACX 642 air conditioning with roof heater)
with code HO4 (Front air conditioning)

AR83.30-T-1762BAS

15

Fill air conditioning system

Model NMB613.355/358/388/455/485
with code HA4 (Konvekta air conditioning with roof heater and timer)
with code HO4 (Front air conditioning)
(Konvekta air conditioner housing version)Model NMB613.358/388
with code HKD (Konvekta ACX 640 air conditioning with roof heater)
with code HO4 (Front air conditioning)

AR83.30-T-1777C

Model NMB613.455
with code HKB (Konvekta ACX 641 SAPTCO air conditioning without roof heater)
with code HO4 (Front air conditioning)
Model NMB613.455
with code HKE (Konvekta ACX 642 air conditioning with roof heater)
with code HO4 (Front air conditioning)

AR83.30-T-1777BAS

16

Pour in coolant



Engine cooling system - check fluid level, adjust to correct level. Inspect anticorrosion/antifreeze protection, adjust to correct concentration

AP20.00-T-2010A

 Cooling system is bled automatically.

17

Carry out function check



Heater and ventilation, heater booster - function check

Model NMB613.355/358/388/455/485 without air conditioning

AP83.00-T-8351B



Air conditioning system - function check

Model 613.355/358/388/455/485
with code HA4 (Konvekta air conditioning with roof heater and timer)

AP83.00-T-8352BA



Air conditioning system - function check

Model NMB613.455
with code HKB (Konvekta ACX 641 SAPTCO air conditioning without roof heater)

AP83.00-T-8352BAS



Air conditioning system - function check

Model NMB613.358/388
with code HKD (Konvekta ACX 640 air conditioning with roof heater)

AP83.00-T-8352BAC



Air conditioning system - function check

Model NMB613.455
with code HKE (Konvekta ACX 642 air conditioning with roof heater)
with code HO4 (Front air conditioning)

AP83.00-T-8352BAD