Compressor HVAC: Service and Repair

AC compressor

Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Preparatory work

Draining the air conditioning (A/C) system and removing the cover

Warning! Follow the safety instructions for work on air conditioning systems.

Read the instructions for slow and fast leaks according to: AC-system, oil, refilling AC-System, Oil, Refilling.

Caution! Always use new O-rings lubricated with compressor oil.

Note! Plug the pipes and connections when working on the climate control system (air conditioning).

Drain the refrigerant from the AC-system according to: Refrigerant, draining Refrigerant, Draining.
Raise the vehicle.
Remove the drive belts. See: Accessory Drive Belt Tensioner, B5254T7 Service and Repair.




Remove the cover under the vehicle. It is secured with 7 clips.

Removal

Removing compressor





Remove:
- the connector to the magnetic clutch
- the pipe connections for the compressor (1) and (2).




- the 3 mounting screws for the compressor.
Remove the compressor.

Installation

Note! For tightening torques, see: Tightening torque, B5254T7 [1][2]Body and Frame.

Installing the compressor




Position the compressor.
- Fasten the compressor with screws, 3 pcs. M8
- Install the longest screw in the rear mounting
- Insert the screws
- Begin by tightening the longest M8
- Tighten the remaining 2 pcs. M8.
It is important to follow the installation instruction to make sure of the AC-compressor's position. In case of wrong installation order, the AC-compressor ends up at an angle. This leads to incorrect loading on the belt tensioner, as well as displacement of the belt and subsequent belt failure!
Connect the connector.
Install the pipe connections, 2 M8 (1) and (2). Ensure that the O-rings are securely located between the compressor and the pipes.
Tighten the screws.
Install the drive belts. See: Accessory Drive Belt Tensioner, B5254T7 Service and Repair.

Finishing

Checking the function and leak tracing
Vacuum pump the air conditioning (A/C) system. See: Vacuum pumping Vacuum Pumping.
Fill the AC-system with refrigerant according to: Refrigerant, filling Refrigerant, Filling.
Leak trace the air conditioning (A/C) system. See: Leak detection, tracer agent Leak Detection, Tracer Agent or.

Checking the performance




Install the shield under the vehicle using the 7 clips.
Carry out a performance test on the climate control unit. See: Climate control system, check Climate Control System, Check.