Expansion Valve: Service and Repair
AR83.30-P-5520T Remove and Install Expansion Valve
Remove
DANGER:
- Risk of explosion from welding or soldering work on closed air conditioning system. Risk of poisoning. Inhaling overheated refrigerant vapors may be toxic. Risk of injury. Contact with liquid refrigerant may result in injury to the skin and eyes.
- Do not carry out any welding work on the closed air conditioning system or in the surrounding area. No smoking or open flames. Wear eye protection 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 discharged.
CAUTION: Protect air conditioning circuit and components from moisture when carrying out repair work.
1 Drain air conditioning (recycle)
NOTE: Note quantity of extracted compressor oil.
2 Remove wiper system
3 Unscrew nut (4)
4 Detach intake line (2) and pressure line (3) from expansion valve (1)
NOTE: Seal the openings in the suction line (2) and pressure line (3), otherwise there may be an ingress of dirt or moisture.
- Set of plugs for air conditioning system
See "Commercially Available Tools" given below.
5 Undo screws (5) and remove expansion valve (1)
NOTE: Seal the openings in the suction line (7) and pressure line (8), otherwise there may be an ingress of dirt or moisture.
- Set of plugs for air conditioning system
See "Commercially Available Tools" given below.
Install
6 Replace sealing rings of suction line (7) and pressure line (8) and moisten the thread of the bolt (5) with compressor oil
7 Screw bolt (5) into retainer plate (6), pull retainer plate (6) forwards and counterhold using a suitable screwdriver
8 Unscrew bolt (5) from retainer plate (6)
9 Position expansion valve (1) and screw in bolts (5)
NOTE: In order to avoid tilting over, tighten the bolts (5) alternately.
- Bolt on expansion valve: 8 N.m
10 Attach suction line (2) and pressure line (3) to expansion valve (1) and screw in nut (4)
CAUTION: The suction line (2) and pressure line (3) must not rest against the body otherwise the suction line (2) and pressure line (3) may be damaged.
NOTE: Replace sealing ring and moisten thread with compressor oil.
- Nut on expansion valve: 10 N.m
11 Install wiper system
12 Replace receiver/drier
13 Evacuate air conditioning system, fill and check for leaks
CAUTION: Too much or too little compressor oil can damage the refrigerant compressor.
NOTE: Add noted quantity of compressor oil (new compressor oil) to air conditioning when filling.
Commercially Available Tools
Commercially Available Tools:
