87341900 Removing and installing air conditioning compressor
WM 873419 Removing and installing air conditioning compressor
Technical values
Preliminary work
Preliminary work for compressor
1. Drain refrigerant for air-conditioning system with one air-conditioning unit. -> 870317 Draining and filling in refrigerant - section on "Draining" Service and Repair
2. Move convertible top to service position -> 6101IN Convertible-top service position.
3. Remove engine compartment lid -> 557819 Removing and installing engine compartment lid.
Engine compartment lid
4. Remove rear wall cover -> 555919 Removing and installing rear wall cover 555919 Removing and Installing Rear Wall Cover.
Cover with grommet
5. Remove drive belt. => Removing and installing drive belt - Removing.
Removing the compressor
Removing compressor
WARNING
Danger of injury and material damage when using Pentosin.
- Risk of skin irritation and damage to skin.
- Damage to hoses and wiring.
-> Wear protective gloves and goggles.
-> In the event of contact (eyes or skin), wash immediately with water.
-> Collect emerging Pentosin.
-> Use caps to protect the wiring against soiling and damage.
-> Clean hoses and wiring immediately.
1. Remove Pentosin from the power-steering reservoir by suction and pour it into a suitable container.
2. Release bayonet lock -arrow- on the power-steering reservoir and remove power-steering reservoir.
Servo-tank
3. Unscrew rear Torx screw for air-conditioning compressor (M8 x 120) -1- between the pipes of the intake system.
Rear screw for air-conditioning compressor
4. Unscrew front Torx screws for air-conditioning compressor (M8 x 90) -1- and -2-.
Front screws for air-conditioning compressor
5. Disconnect electric plug connection on the air-conditioning compressor's electrical line.
6. Unclip refrigerant hoses -1- and -2- between body and intake-air distributor.
Refrigerant hoses
Information
- After removal, place the air-conditioning compressor on a suitable protective support (e.g. foam, neoprene, etc.).
7. Guide refrigerant compressor through the rear wall opening and place on a suitable surface on the centre tunnel.
Air-conditioning compressor
8. Unscrew both fastening screws -1, 2- , pull out the refrigerant lines carefully and close them immediately with suitable plugs.
Unscrewing fastening screw
Subsequent work
Subsequent work for compressor
1. Check Pentosin level in power-steering reservoir -> 480201 Checking power-steering fluid level 48020150 Checking the fluid level for power steering.
2. Install rear underbody cover. -> 519419 Removing and installing rear trim 519419 Removing and Installing Cover for Rear Underbody
3. Install rear wall cover -> 555919 Removing and installing rear wall cover 555919 Removing and Installing Rear Wall Cover.
Cover with grommet
4. Install engine compartment lid -> 557819 Removing and installing engine compartment lid.
Engine compartment lid
5. Fill refrigerant on the air-conditioning system in accordance with regulations. -> 870317 Draining and filling in refrigerant Service and Repair
6. Open air exhaust nozzles on the dashboard, and set fan to at least 75 %.
7. After allowing the system to stabilise at idle speed (approx. 5 sec.), switch on air conditioner and allow the engine to run uninterrupted for at least 2 minutes at 1500 rpm.
8. Switch off the air conditioner again. Do not drive until the air conditioner has been filled.
9. Start engine. Turn the steering wheel from stop to stop while the engine is running in order to bleed the steering system.
Checking refrigerant oil in "new" air conditioning compressor
Correct the refrigerant oil level in the "new" air conditioning compressor
NOTICE
Too much or too little refrigerant oil in air conditioning circuit
- Reduced cooling output
- Lack of lubrication and failure of the air conditioning compressor
-> If a new air conditioning compressor or a component in the circuit is replaced, the oil quantity must be checked and adjusted.
Information
All connection points must be completely dirt-free.
The air-conditioning compressor must be dry (washing the vehicle) and the air-conditioning compressor and lines must be free of moisture.
The connection points must be closed after they have been opened. Use the original transport caps.
A clean measuring cylinder with a capacity of approx. 300 ml is required.
Determining oil quantity on the "old" air conditioning compressor
1. First, open the cap on the high-pressure side and relieve the pressure from the compressor -A-.
Caps
2. Open the oil filler screw -B- on the compressor.
3. Fill the refrigerant oil from the air conditioning compressor into the measuring cylinder. Turn the pressure plate on the air conditioning compressor (not the belt pulley) when emptying the refrigerant oil.
The amount of refrigerant oil is referred to as "Vold" in the formula below.
4. Always replace the sealing ring for the oil filler plug.
5. Screw oil filler plug -B- into the compressor. => Tightening torque: 30 Nm (22 ftlb.)
Determining oil quantity on the "new" air conditioning compressor
Oil filler screw
1. To drain refrigerant oil:
1.1. First, open the cap on the high-pressure side and relieve the pressure from the compressor -A-.
1.2. Open the oil filler screw -B- on the compressor.
1.3. Drain the refrigerant oil from the air conditioning compressor.
The refrigerant oil must not be re-used, but must be disposed of properly.
2. To determine the refrigerant oil quantity:
2.1. Vtotal = "Vremoved" + "Vold" + 20 cm3
2.2. Vtotal= Total volume for the new air conditioning compressor
2.3. Vremoved = Volume of refrigerant oil removed by suction
2.4. Vold = Volume of refrigerant oil in the old air conditioning compressor
2.5. 20 cm3 = Additional safety volume
3. To fill the air conditioning compressor:
3.1. Fill the determined refrigerant oil volume Vtotal into the air conditioning compressor.
3.2. Always replace the sealing ring for the oil filler plug.
3.3. Screw oil filler plug -B- onto the compressor. => Tightening torque: 30 Nm (22 ftlb.)
3.4. Install air conditioning compressor.