Expansion Valve

Expansion Valve

• After switching off the A/C compressor in this vehicle, it may take a relatively long time for the pressure on the high pressure side to decrease. This is because the expansion valve is cold and the pressure on the low pressure side increases quickly after shutting the compressor off, then the expansion valve closes and the refrigerant flows slowly to the low pressure side.

Removing

- Discharge refrigerant circuit.

- Disconnect refrigerant lines from expansion valve. Refer to=> [ Expansion Valve Refrigerant Lines, Disconnecting and Connecting ] Expansion Valve Refrigerant Lines, Disconnecting and Connecting.

- Remove bolts - A - (tightening specification: 10 Nm).






- Pull expansion valve - B - out of heat protection insulation - C -.

• Seal all open lines and connections on evaporator with suitable caps (avoid dirt and moisture from entering the system).

Installing

Installation is carried out in the reverse order while noting the following:

- Replace O-rings seals - D - and - E -. Refer to=> [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-Rings and Electronic Parts Catalog.

- Make sure that O-rings - D - and - E - are properly seated on connecting pipes to evaporator - F - and - G -.

• Expansion valve is available in different versions (same housing but a different control characteristic), therefore ensure the exact allocation. Refer to Electronic Parts Catalog (ETKA).






• Coat the O-ring seals lightly with refrigerant oil prior to installation. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-Rings.

• If heat protection insulation - C - is missing or not installed correctly, it can cause reduced performance of the A/C system (change of adjusted control characteristic of expansion valve due to radiant heat).

- Evacuate and re-charge refrigerant circuit.

- Operate the A/C system after filling the refrigerant circuit. Refer to=> [ A/C System, Operating After Filling Refrigerant Circuit ] Procedures.

• Note the information regarding operating the A/C system after filling.