Housing Assembly HVAC: Service and Repair

Climate control unit, replacing

Special tools:
115 8957 HOSE PLIERS 115 8957 Hose Pliers

Climate control unit assembly

Preparations

Note! Read off data from the control module before replacing the control module. This is carried out via VIDA communication. After replacing the control module, the relevant parameters must be programmed into the new control module.

Before starting work on the climate control system

Caution! Follow the safety instructions for work on air conditioning (A/C) systems. See Refrigerant, safety regulations Technician Safety Information.

Note! First read the instructions covering slow and quick leaks.

Note! Always plug pipes and connectors when working on the climate control system.

Climate control unit assembly

Removal
First read section Preparations.

Work in the engine compartment
- Disconnect the battery lead. See Battery, replacing Battery, Replacing
- Drain the refrigerant from the system. See Refrigerant, draining Refrigerant, Draining.




- Clamp the heating hoses using lock grip pliers 115 8957 HOSE PLIERS 115 8957 Hose Pliers
- Disconnect the heater hoses from the heat exchanger by pressing in the hose connector. Turn it to the side so that the hose can be pulled out
- Plug the pipes for the heat exchanger
- the cover plate and the rubber seal for the lead-in.





Remove:
- the windshield wiper. See Motor, windshield wiper, replacing Motor, Windshield Wiper, Replacing
- the cowl, gutter and rain protection. See Cowl and gutter, replacing Cowl and Gutter, Replacing
- Remove the cover for the connectors in the engine compartment-passenger compartment
- Remove the screw from the member
- Disconnect the connectors by screwing the connectors upwards so that the threads release. Then remove the connectors.
Additional work in the engine compartment on cars with air conditioning (A/C)




Remove the heat deflector plate on the firewall. See Replacing the heat shield for the Thermostatic expansion valve Replacing the Heat Shield for the Thermostatic Expansion Valve.




Remove the locking bracket for the refrigerant pipes
- Disconnect the refrigerant pipes from the expansion valve.
Work in the passenger compartment

Remove:
- the dashboard and center console. See (engine B5254T4) or Dashboard, replacing Dashboard, Replacing (other engines).

Note! Move the front seat as far back as possible. Protect the floor and sills.

The climate control unit and the member from the bodywork

Remove:
- the steering column from the member.




- the screws to the left and right of the A-post
- the screws to the left and right of the center console.





Remove:
- the air ducts from the floor heater unit
- the floor guttering on the left and right sides.
Pull the member for the climate control unit backwards a little.

The climate control unit from the member in the passenger compartment





Remove:
- the tie straps for the cable duct on the passenger side.

Remove:
- the cable duct behind and above the climate control unit and on the driver's side.





Remove:
- the 2 screws from the climate control unit-member on the passenger side
- the screws connecting the member to the climate control unit on the left and right-hand sides.

Remove:
- the switch for the blower fan motor.

Lift:
- the cable duct behind / above the member on the passenger side
- the cable duct above and behind the mounting for the member.





Loosen:
- the member from the climate control unit.
Hold up the member and cable duct on the passenger side. Remove the climate control unit on the passenger side.

Note! Two people required.

Installation

The climate control unit on the passenger compartment member




- Check and replace the floor seals if necessary.





Install:
- the front seal for the refrigerant pipe. Check and replace the O-rings.





Position:
- the climate control unit in the car
- the member on the climate control unit
Note! Two people required.

Install:
- the screws and the bracket on the member for the climate control unit.
- Install and secure the cable duct
- Check and position the cables for the radio and the dashboard environment unit.
- Take out the cable for the sensor on the dashboard and light switch.
- Position the member for the climate control unit against the firewall
- Check the location in relation to the opening for the coolant and heat exchange pipes.
- Press the member for the climate control unit into position against the firewall A-post
- Secure the member for the climate control unit against the A-post loosely with the screws.
- Secure the member for the climate control on the center console loosely using the screws.

Tighten:
- the member on the A-post
- the screws on the center console.
- Install the air ducts.

Other work in the passenger compartment
- In reverse order
- The cross member must be tightened to the A-post. Tighten to 50 Nm
- The screws in the center console must be tightened. Tighten to 25 Nm.

Work in the engine compartment
- In reverse order
Vacuum pump and test the system. See Refrigerant, draining Refrigerant, Draining
Fill the system with refrigerant. Check for leaks. See Refrigerant, draining Refrigerant, Draining.
Install the battery lead. See Battery, replacing Battery, Replacing.

Ordering software
Order applicable software.