Refrigerant Pipe With Inner Heat Exchanger
Refrigerant Pipe with Inner Heat Exchanger
Special tools, testers and auxiliary items required
• Release tool for air conditioner couplings (T40149) or removal tool (T40232)
• Engine bung set (VAS 6122)
- Turn off the ignition.
- Drain the refrigerant circuit.
• Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected (for example, on the Audi Q5).
- Remove the plenum chamber cover and/or the cowl panel (there are different versions).
- Disconnect the ground cable from the battery (A).
• From MY 10 and on certain versions and depending on the engine, refrigerant lines with an inner heat exchanger - A - are installed which have an additional weight (balance) - Removal and Installation - to reduce noise. When installing refrigerant pipes with an inner heat exchanger - A - and the plenum chamber, make sure the weight - B - and the refrigerant pipes - A - are not too close or touching the other components.
- Remove the refrigerant line from the quick-release coupling connections. Refer to => [ Refrigerant Lines Disconnecting from Quick-Release Couplings and Connecting ] Refrigerant Lines Disconnecting From Quick-Release Couplings and Connecting
• Close all open lines and connections on the refrigerant line with suitable caps (avoid dirt and moisture from entering the system).
- Loosen the plenum chamber front all - A - from the vehicle.
• Both coolant hoses are routed to the heater core through the plenum chamber front wall - A -. On these vehicles, loosen the grommet on both coolant hoses and move the plenum chamber front wall to the side (when doing this, the refrigerant circuit must not be opened).
• When loosening the plenum chamber front wall, be careful not to damage the brake booster vacuum line.
- Disengage the catches - arrows A - and remove the upper part of the line pass-through - 2 - upward - arrow B -.
• Disregard - item 1 -.
- Loosing the wiring harness from the lower part of the line pass-through - 2 - and remove the lower part.
- Remove the nut - C - on the suspension strut tower.
- Remove screws - A -.
- Disconnect the refrigerant line - B - with the inner heat exchanger from the expansion valve.
• Seal the open connections on the refrigerant line and on the expansion valve with suitable caps (to prevent dirt and moisture from entering the system).
Installing
Installation is done is reverse order, observe the following:
- Thoroughly clean all the connections in the expansion valve - B - and in the refrigerant line - D - with the inner heat exchanger.
- Check the connections in the expansion valve - B - and on the refrigerant line - D - for damage.
- Replace the quick acting coupling connectors on the refrigerant line with inner heat exchanger. Refer to => [ Refrigerant Lines Disconnecting from Quick-Release Couplings and Connecting ] Refrigerant Lines Disconnecting From Quick-Release Couplings and Connecting.
- Replace the O-rings - A - and - C -. Refer to Electronic Parts Catalog (ETKA).
• Follow the instructions for installing the O-rings. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-Rings.
- Coat the O-ring seals with refrigerant oil prior to installation. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-Rings.
- Make sure the O-rings fit properly inside the grooves on the refrigerant line connections - D -.
- Tighten the bolts - E - for the refrigerant line - D - with inner heat exchanger.
• Tightening specification - E -: 10 Nm.
- Tighten the nut - C - for the refrigerant line - B -.
• Install refrigerant line such that it is not strained.
• Check installation position of refrigerant line to expansion valve (it should not come in contact with other components).
- Install the refrigerant line to the quick acting couplings. Refer to => [ Refrigerant Lines Disconnecting from Quick-Release Couplings and Connecting ] Refrigerant Lines Disconnecting From Quick-Release Couplings and Connecting.
- Install the remaining removed components.
- Evacuate and fill the refrigerant circuit.
- Switch on the ignition.
- Check the Climatronic control module (J255) DTC memory and erase any displayed malfunctions if necessary. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".
- Operate the A/C system after filling the refrigerant circuit. Refer to => [ A/C System, Operating after Filling Refrigerant Circuit ] A/C System, Operating After Filling Refrigerant Circuit.
• Note the information regarding operating the A/C system after filling.